UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Form 10-K

(Mark One)

For the fiscal year ended December 31, 2014

OR

For the transition period from           to          

Commission file number: 000-24085

AXT, INC.
(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (510) 683-5900
Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by checkmark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act
o Yes ☒ No

Indicate by checkmark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.
o Yes ☒ No

Indicate by checkmark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. ☒ Yes o  No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). ☒ Yes o  No

Indicate by checkmark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. o

Indicate by checkmark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Act. (Check one):

Indicate by checkmark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). o Yes ☒  No

The aggregate market value of the voting stock held by non-affiliates of the registrant, based upon the closing sale price of $2.14 for the common stock on June 30, 2014 as reported on the Nasdaq Global Market, was approximately $53,550,000. Shares of common stock held by each officer, director and by each person who owns 5% or more of the outstanding common stock have been excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not a conclusive determination for other purposes.

As of March 3, 2015, 32,840,752 shares, $0.001 par value, of the registrant’s common stock were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the definitive proxy statement for the registrant’s 2015 annual meeting of stockholders to be filed with the Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this form are incorporated by reference into Part III of this Form 10-K report. Except for those portions specifically incorporated by reference herein, such document shall not be deemed to be filed with the Commission as part of this Form 10-K.

TABLE OF CONTENTS

PART I

This Annual Report (including the following section regarding Management’s Discussion and Analysis of Financial Condition and Results of Operations) contains forward-looking statements regarding our business, financial condition, results of operations and prospects. Words such as “expects,” “anticipates,” “intends,” “plans,” “believes,” “seeks,” “estimates,” “goals,” “should,” “continues,” “would,” “could” and similar expressions or variations of such words are intended to identify forward-looking statements, but are not the exclusive means of identifying forward-looking statements in this Annual Report. Additionally, statements concerning future matters such as our strategy, plans and investments, industry trends, the impact of trends and economic cycles on our business, customer demand, the development of new products, applications, enhancements or technologies, sales levels, expense levels, planned investments and other statements regarding matters that are not historical are forward-looking statements

Although forward-looking statements in this Annual Report reflect the good faith judgment of our management, such statements can only be based on facts and factors currently known by us. Consequently, forward-looking statements are inherently subject to risks and uncertainties and actual results and outcomes may differ materially from the results and outcomes discussed in or anticipated by the forward-looking statements. Factors that could cause or contribute to such differences in results and outcomes include without limitation those discussed under the heading “Risk Factors” in Item 1A below, as well as those discussed elsewhere in this Annual Report. Readers are urged not to place undue reliance on these forward-looking statements, which speak only as of the date of this Annual Report. We undertake no obligation to revise or update any forward-looking statements in order to reflect any event or circumstance that may arise after the date of this Annual Report. Readers are urged to carefully review and consider the various disclosures made in this Annual Report, which attempt to advise interested parties of the risks and factors that may affect our business, financial condition, results of operations and prospects.

Item 1. Business

AXT, Inc. (“AXT”, “we,” “us,” and “our” refer to AXT, Inc. and all of its subsidiaries) is a worldwide developer and producer of high-performance compound and single element semiconductor substrates, also known as wafers. The dominant substrates used in producing semiconductor chips are made from silicon. However, certain chips may become too hot or perform their function too slowly if silicon is used as the base material. Alternative or specialty materials are used to replace silicon as the preferred base for the electronic circuit in these situations. We provide such alternative or specialty materials in the form of substrates or wafers, including compound and single element substrates. Our compound substrates combine gallium with arsenic (GaAs) or combine indium with phosphorous (InP). Our single element substrates are made from germanium (Ge). Most of our revenue is from sales of GaAs substrates. We currently sell the following substrate products in the sizes and for the applications indicated:

We manufacture all of our semiconductor substrates using our proprietary vertical gradient freeze (VGF) technology. We manufacture all of our products in the People’s Republic of China (PRC or China), which generally has favorable costs for facilities and labor compared with comparable facilities in the United States, Europe or Japan. Our supply chain includes AXT subsidiaries and joint ventures in China. We believe this supply chain arrangement provides us pricing advantages, reliable supply and enhanced sourcing lead-times for key raw materials which are central to our final manufactured products. Our subsidiaries and joint ventures produce products including 99.99% pure gallium (4N Ga), high purity gallium, arsenic, germanium, germanium dioxide, pyrolytic boron nitride (pBN)

crucibles and boron oxide (B2O3). Our ownership and the ownership held by our consolidated subsidiaries in these entities ranges from 20% to 83%. We consolidate, for accounting purposes, the joint ventures in which we have majority or controlling financial interest and significant influence on management, and employ equity accounting for the joint ventures in which we have a smaller ownership interest. We purchase portions of the materials produced by these joint ventures for our own use and the joint ventures sell the remainder of their production to third parties. We use our direct sales force in the United States and China, and independent sales representatives in Europe and other parts of Asia to market and sell our substrates.

We were incorporated in California in December 1986 and reincorporated in Delaware in May 1998. We changed our name from American Xtal Technology, Inc. to AXT, Inc. in July 2000. Our principal corporate office is located at 4281 Technology Drive, Fremont, California 94538, and our telephone number at this address is
(510) 683-5900.

Industry Background

Certain electronic and opto-electronic applications have performance requirements that exceed the capabilities of conventional silicon substrates and often require high-performance compound or single element substrates. Examples of higher performance non-silicon based substrates include GaAs, InP, gallium nitride (GaN), silicon carbide (SiC) and Ge.

For example, power amplifiers and radio frequency integrated circuits for wireless handsets and other wireless devices are made with semi-insulating GaAs substrates. Semi-conducting GaAs substrates are used to create opto-electronic products including high brightness light emitting diodes (HBLEDs) that are often used to backlight wireless handsets and liquid crystal display (LCD) TVs and are also used for automotive panels, signage, display and lighting applications. InP is a high performance semiconductor substrate used in broadband and fiber optic applications. Ge substrates are used in emerging applications such as solar cells for space and terrestrial photovoltaic applications.

The AXT Advantage

We believe that we benefit from the following advantages:

are either privately owned or are a small division of large publicly traded companies. We believe the combination of access to U.S. capital markets, U.S.-based product quality standards and China-based manufacturing is an attractive business model to our customers who desire longevity and stability in their supply chain as well as low cost.

Strategy

Our goal is to become the leading worldwide supplier of high-performance compound and single element semiconductor substrates. Key elements of our strategy include:

Offer diverse products, including custom products. We believe AXT has a reputation in the market place for providing a broad range of products, including custom products. We plan to further promote this brand image as a way to differentiate ourselves in the market place. Some competitors provide only gallium arsenide substrates. We provide gallium arsenide and also indium phosphide and germanium substrates. Some competitors provide only six inch wafers. Our wafers range from one inch up to six inches. We also produce substrates with customer defined specifications which may range from thickness or smoothness and may include adding special additional chemicals such as iron or sulfur. We believe product diversity can mitigate some of the impact of down cycles in our market because we are not dependent on a single product or application for revenue.

Many customers not just a few large customers. We seek to expand our customer base and avoid dependence on just a few large customers. We believe our diverse product offering has resulted in a diverse customer base. For the year ended December 31, 2014, no customer accounted for over 10% of revenue and our five largest customers accounted for 34% of our revenue. We believe customer diversity provides a measure of stability in troubled market conditions. Customer diversification may also enable us to achieve a higher average selling price by reducing our dependence on larger customers with pricing power.

China-based manufacturing. We seek to leverage our China-based manufacturing advantage by increasing efficiencies in our manufacturing methods, systems and processes. In 1998 we decided to locate our manufacturing in China and in 1999 we began to move our manufacturing to facilities on the outskirts of Beijing. Approximately 97% of our employees are based in China. This enables us to compete more effectively against our competitors who, by comparison, are in relatively high cost locations such as Japan and Germany. We plan to further leverage these advantages by investing in training and equipment to increase productivity and reduce cost. It is our strategy to combine the benefits of U.S.-based quality and U.S.-based access to capital markets with China-based manufacturing.

Increase productivity and profitability in our 10 subsidiaries/joint ventures. AXT’s substrate products are based on specialty materials, many of which are mined and refined in China. The supply and demand equation for specialty materials can be complex and can be volatile. Our strategy to maintain a stable supply chain has been to establish and nurture startup companies in China where we have a significant or majority ownership position or at least a significant equity position. Over the years we have established or invested in 10 companies who are an integral part of our supply chain. We will continue to provide strategic support to these companies and they, in turn, will continue to be the backbone of our supply chain. We plan to work closely with these companies to increase their productivity and profitability as they continue to support AXT’s supply chain.

Sell raw materials into the market place. We leverage the established capabilities of our 10 subsidiaries and joint ventures by authorizing them to sell materials into the open market, including to some of our direct competitors. For the year ended December 31, 2014 approximately a quarter of our consolidated revenue was derived from the sale of raw materials to third parties.

Promote AXT’s longevity and stability. We believe recent market trends, including the exit of one of our major competitors in Japan from the gallium arsenide substrate market, has highlighted supply continuity concerns among our customers. Since AXT was established in 1986 and has been a publicly traded company since 1998, we plan to promote our long operating history and highlight our position as a stable, reliable and long term provider of substrates and materials by among other things, investing in research and development and high-end processing equipment.

Materials of the future. The specialty materials substrate market is dynamic and subject to continued changes and cycles. We plan to use our deep knowledge and experience in specialty materials and wafer substrates to seek new applications for existing substrates in our portfolio and explore additional materials that may be synergistic with our knowledge base, customer needs and manufacturing lines.

Technology

There are basically three technologies for crystal growth in our business: Vertical Gradient Freeze (VGF), Liquid Encapsulated Czochralski (LEC), and Czochralski (CZ). Our core technologies include our proprietary VGF technology used to produce high-quality crystals that are processed into compound substrates or wafers. Our subsidiaries and joint venture companies have refining and processing technologies which enables them to produce materials we use in the manufacture of our products.

Our VGF technology is designed to control the crystal-growth process with minimal temperature variation and is the current technology we use to produce our GaAs, InP and Ge substrates. Unlike traditional methods, our VGF technology places the hot compound melt above the cool crystal, and minimizes the temperature gradient between the crystal and the melt which reduces the turbulence at the interface of the melt and the solid crystal. In comparison, in the LEC method the melt and crystal are inverted, there is a higher temperature gradient between the melt and the crystal, and more turbulence at the interface of the melt and solid crystal. These aspects of the VGF technology enable us to grow crystals that have a relatively low defect density and high uniformity. The crystal and the resulting substrate are mechanically strong, resulting in lower breakage rates during a customer’s manufacturing process. Since the temperature gradient is controlled electronically rather than by physical movement, the sensitive crystal is not disturbed as it may be during some of our competitors’ VGF-like growth processes. In addition, the melt and growing crystal are contained in a closed chamber, which isolates the crystal from the outside environment to reduce potential contamination. This substrate isolation allows for more precise control of the gallium-to-arsenic ratio, resulting in better consistency and uniformity of the crystals.

We believe that our proprietary VGF technology offers several benefits for producing our GaAs substrates when compared to traditional crystal growing technologies. The Horizontal Bridgman (HB) process is the traditional method for producing semi-conducting GaAs substrates for opto-electronic applications, but because of the techniques used to hold the GaAs melt, the HB technique cannot be used cost-effectively to produce substrates greater than three inches in diameter. In addition, the HB technique houses the GaAs melt in a quartz container during the growth process, which can contaminate the GaAs melt with silicon impurities, making it unsuitable for producing semi-insulating GaAs substrates.

We believe our VGF technology also offers advantages over the LEC method for producing semi-insulating GaAs substrates for wireless applications. Unlike the VGF process, the LEC process can result in greater turbulence in the melt, and at a temperature gradient that is significantly higher than VGF, which can cause LEC-grown crystals to have a higher dislocation density than VGF-grown crystals, resulting in a higher rate of breakage during the device manufacturing process. However, the LEC technique can be useful for GaAs semi-conducting substrates since the LED application specifications and requirements are less stringent than those of wireless applications.

Products

We design, develop, manufacture and distribute high-performance semiconductor substrates, also known as wafers. We make semi-insulating GaAs substrates used in making semiconductor chips in applications such as

amplifiers and switches for wireless devices. Our semi-conducting GaAs substrates are also used to create opto-electronic products including High Brightness LEDs, which are often used to backlight wireless handsets and LCD TVs and for automotive, signage, display and lighting applications. InP is a high-performance semiconductor substrate used in broadband and fiber optic applications. Ge substrates are used in emerging applications such as triple junction solar cells for space and terrestrial photovoltaic applications and for optical applications.

The table below sets forth our products and selected applications:

Substrates. We currently sell compound substrates manufactured from GaAs and InP, as well as single-element substrates manufactured from Ge. We supply both semi-insulating and semiconducting GaAs substrates in one -, two-, three-, four-, five- and six-inch diameters. We supply InP substrates in two-, three- and four-inch diameters, and Ge substrates in two-, four- and six-inch diameters. Many of our customers require customized specifications such as special levels of iron or sulfur dopants or the wafer thickness.

We have a long operating history and offer a relatively broad range of products. We promote our product diversity as a way to differentiate ourselves in the market place. Some competitors provide only gallium arsenide substrates. We provide gallium arsenide and also indium phosphide and germanium substrates. Some competitors provide only six inch wafers. Our wafers range from one inch up to six inches. We also produce substrates with customer defined specifications which may range in thickness or smoothness and may include adding special additional chemicals such as iron or sulfur. In addition to our wafers or substrates we also generate revenue from our consolidated subsidiaries who sell raw materials. Product diversity can mitigate some of the down cycles in our market because we are not dependent on a single product or application for revenue.

Materials. We have 10 subsidiaries and joint ventures in China that sell raw materials that may be used in substrate manufacturing or for other purposes. These companies produce products including 99.99% pure gallium (4N Ga), high purity gallium, gallium alloys, indium phosphide poly-crystal, germanium, germanium dioxide, high purity arsenic, pyrolytic boron nitride crucibles and boron oxide.

Customers

Before specialty material wafers can be processed in a typical wafer manufacturing facility that constructs the electronic circuit on a chip, a thin layer of structured chemicals must be grown on the surface of the substrate. This is called an epitaxial layer. We sell our substrates to companies that apply the epitaxial layer, who then in turn sell the modified wafers to the wafer fabs, chip design companies, LED manufacturers and others.

Epitaxial layer companies that form our customer base are located in Europe, the United States and Asia. We also sell product to universities and other research organizations who use specialty materials for experimentation in various aspects of semiconducting and semi insulating applications.

We have at times sold a significant portion of our products in any particular period to a limited number of customers. However, no customer represented more than 10% of our revenue for the years ended December 31, 2014 and 2013. IQE Group represented approximately 17% of our revenue for the year ended December 31, 2012. Our top five customers, although not the same five customers for each period, represented 34%, 31% and 37% of our revenue for the years ended December 31, 2014, 2013 and 2012, respectively.

There were three third-party customers for the raw materials products from our subsidiaries and joint ventures that accounted for 20%, 13% and 11% of the revenue from raw materials sales for the year ended December 31, 2014,

three customers for the raw materials products from our subsidiaries and joint ventures that accounted for 11%, 10% and 10% of the revenue from raw materials sales for the year ended December 31, 2013 and one customer for the raw materials products from our subsidiaries and joint ventures that accounted for 19% of the revenue from raw materials sales for the year ended December 31, 2012. Our subsidiaries and joint ventures are a key strategic benefit for us as they further diversify our sources of revenue.

Manufacturing, Raw Materials and Supplies

We manufacture all of our wafers/substrate products at our facilities in Beijing, China. We believe this location generally has favorable costs for facilities and labor compared to the United States or compared to the location of some of our competitors in Japan and Germany.

We use a two-stage manufacturing process. The first stage deploys our VGF technology for the crystal growth of single element or compound element ingots in diameters currently ranging from one inch to six inch. The growth process occurs in high temperature furnaces built using our proprietary designs. Growing the crystalline elements into cylindrical ingots can take four to twelve days, depending on the diameter and length of the ingot produced. The second stage includes slicing or sawing the ingot into wafers or substrates, then processing each substrate to strict specifications, including grinding to reduce the thickness and then polishing and cleaning each substrate. Many of the process steps utilize proprietary knowledge and chemical baths.

Wafers from each ingot will include some material that does not meet specifications or quality standards. Defects may occur as a result of inherent factors in the materials used in the crystalline growth process. They may also result from variances in the manufacturing process. We have many steps in our line that are partially or fully automated but other manufacturing steps are performed manually. We intend to increase the level of automation. Due to potential defects, yield is a key factor in our manufacturing cost. Other key elements are the initial cost of the raw material elements, manufacturing equipment, factory loading, facilities and labor. Our Beijing facilities are approximately 300,000 square feet and we employ approximately 705 employees at this site. In the first quarter of 2014, we instituted a reduction in force and other cost savings steps and in connection with this restructuring plan we incurred charges of approximately $907,000. We believe our current employee base is appropriate for our current production volume.

We have formed 10 subsidiaries and joint ventures in China that form the backbone of our supply chain model. These companies provide us with reliable supply and shorter lead-times for raw materials central to our manufactured products including gallium, gallium alloys, indium phosphide poly-crystal, germanium, germanium dioxide, high purity arsenic, pBN and boron oxide. We believe that these subsidiaries and joint ventures have been and will continue to be advantageous in allowing us to procure materials to support our planned growth. In addition, we purchase supply parts, components and raw materials from several other domestic and international suppliers. We depend on a single or limited number of suppliers for certain critical materials used in the production of our substrates, such as quartz tubing and polishing solutions. We generally purchase our materials through standard purchase orders and not pursuant to long-term supply contracts.

Sales and Marketing

We sell our substrate products directly to customers through our direct salesforce in the United States and Asia and through independent sales representatives and distributors in Europe and some parts of Asia. Our direct salesforce is knowledgeable in the use of compound and single-element substrates. Our application engineers work with customers during all stages of the substrate manufacturing process, from developing the precise composition of the substrate through manufacturing and processing the substrate to the customer’s specifications. We believe that maintaining a close relationship with customers and providing them with ongoing engineering support improves customer satisfaction and will provide us with a competitive advantage in selling other substrates to our customers.

International Sales. International sales are a substantial part of our business. Sales to customers outside North America (primarily the United States) accounted for 88% of our revenue in 2014 and 2013 and 83% of our revenue in 2012. The primary markets for sales of our substrate products outside of the United States are to customers located in Asia and Western Europe.

Our subsidiaries and joint ventures sell specialty raw materials including 4N, 5N, 6N, 7N and 8N gallium, boron oxide, germanium, arsenic, germanium dioxide, pyrolytic boron nitride crucibles used in crystal growth and parts for MBE (Molecular Beam Epitaxy). These subsidiaries and joint ventures have their own separate sales forces and sell directly to their own customers in addition to selling raw materials to us.

Research and Development

To maintain and improve our competitive position, we focus our research and development efforts on designing new proprietary processes and products, improving the performance of existing products, increasing yields and reducing manufacturing costs. We have assembled a multi-disciplinary team of skilled scientists, engineers and technicians to meet our research and development objectives.

Our current substrate research and development activities focus on continued development and enhancement of GaAs, InP and Ge substrates, including improved yield, enhanced surface and electrical characteristics and uniformity, greater substrate strength and increased crystal length. During 2014, we continued to focus research and development resources to reduce surface quality problems we experienced with our substrates for some customers, particularly related to surface morphology. Although some major problems related to surface quality have been resolved, we still need to continue to improve in this area and expect that this effort in research and development will continue in 2015. One of our joint ventures has been working on research and development projects to qualify for a government incentive program for reduced future tax rates in China and will continue this effort in 2015.

Research and development expenses were $4.1 million in 2014, compared with $3.4 million in 2013 and $3.5 million in 2012.

Competition

The semiconductor substrate industry is characterized by rapid technological change and price erosion, as well as intense competition. We compete in the market for GaAs substrates with our expertise in VGF technology, product quality, response times and prices. However, we face actual and potential competition from a number of established companies who may have advantages not available to us including substantially greater financial, technical and marketing resources; greater name recognition; and more established relationships in the industry and they may utilize these advantages to expand their product offerings more quickly, adapt to new or emerging technologies and changes in customer requirements more quickly, and devote greater resources to the marketing and sale of their products.

We believe that the primary competitive factors in the markets in which our substrate products compete are:

Our ability to compete in target markets also depends on factors such as:

A compound semiconductor substrate customer typically has two or three substrate suppliers that it has qualified for the production of its products. These qualified suppliers must meet industry-standard specifications for quality, on-time delivery and customer support. Once a substrate supplier has qualified with a customer, price, consistent quality and current and future product delivery lead times become the most important competitive factors. A supplier that cannot meet customers’ current lead times or that a customer perceives will not be able to meet future demand and provide consistent quality can lose current market share. Our primary competition in the market for compound semiconductor substrates includes Freiberger Compound Materials, JX, Umicore, Sumitomo Electric Industries and China Crystal Technology Corp., (CCTC). We believe that at least two of our competitors are shipping high volumes of GaAs substrates manufactured using a technique similar to our VGF technique. In addition, we also face competition from semiconductor device manufacturers that produce substrates for their own use, and from

companies, such as TriQuint Semiconductors, RFMD and Skyworks that are actively developing alternative materials to GaAs and marketing semiconductor devices using these alternative materials. Furthermore, silicon-on-insulator (SOI) technology, a silicon wafer technology that produces higher performing and lower power consumption devices, has been proven in the market. In 2011 to 2013, SOI technology displaced GaAs chips in key sectors, primarily the radio frequency (RF) switching function in cell phones.

However, because of our vertically integrated, sophisticated supply chain through our subsidiaries and joint ventures, we believe we are the only compound semiconductor substrate supplier to offer a full suite of raw materials and we believe that this gives us a strong competitive advantage in our marketplace.

Protection of our Intellectual Property

Our success and the competitive position of our VGF technology depend on our ability to maintain our proprietary trade secrets and other intellectual property protections. We rely on a combination of patents, trademark and trade secret laws, non-disclosure agreements and other intellectual property protection methods to protect our proprietary technology. We believe that, due to the rapid pace of technological innovation in the markets for our products, our ability to establish and maintain a position of technology leadership depends as much on the skills of our research and development personnel as upon the legal protections afforded our existing technologies. To protect our trade secrets, we take certain measures to ensure their secrecy, such as executing non-disclosure agreements with our employees, customers and suppliers. However, reliance on trade secrets is only an effective business practice insofar as trade secrets remain undisclosed and a proprietary product or process is not reverse engineered or independently developed.

To date, we have been issued thirty (30) patents that relate to our VGF products and processes, nine (9) in the United States (US), four (4) in Japan (JP), fourteen (14) in China (CN), one (1) in Europe (EP), one (1) in Canada (CA), and one (1) in Korea (KR), which expire in 2016 (1 US), 2017 (1 US), 2018 (1 CN), 2021 (6 CN), 2020 (4 CN), 2022 (1 US, 1 CA, 1 EP, 2 JP, 1 KR), 2027 (2 US), 2028 (1 US, 3 CN), 2029 (1 JP), 2030(1 US, 1 JP), and 2032 (2 US). We have one (1) US patent application pending and ten (10) foreign patent applications pending in Europe (1), China (5), Japan (2) and Taiwan (2).

In the normal course of business, we periodically receive and make inquiries regarding possible patent infringement. In dealing with such inquiries, it may become necessary or useful for us to obtain or grant licenses or other rights. However, there can be no assurance that such licenses or rights will be available to us on commercially reasonable terms. If we are not able to resolve or settle claims, obtain necessary licenses on commercially reasonable terms and/or successfully prosecute or defend our position, our business, financial condition and results of operations could be materially and adversely affected.

Environmental Regulations

We are subject to federal, state and local environmental laws and regulations, including laws in China as well as in the United States and Europe. These laws, rules and regulations govern the use, storage, discharge and disposal of hazardous chemicals during manufacturing, research and development and sales demonstrations. We maintain a number of environmental, health and safety programs that are primarily preventive in nature. As part of these programs, we regularly monitor ongoing compliance. If we fail to comply with applicable regulations, we could be subject to substantial liability for personal injury, clean-up efforts, fines and suspension or cessation of our operations.

Employees

As of December 31, 2014, we had approximately 729 employees which consisted of approximately 24 employees in our headquarters in Fremont and approximately 705 employees in Beijing. In addition, our three consolidated subsidiaries and joint ventures had, in total, approximately 366 employees. In aggregate, we and our subsidiaries had 1,095 employees, of whom 906 were principally engaged in manufacturing, 122 in sales and administration, and 67 in research and development. Of these employees, 24 were located in the United States and 1,071 in China.

As of December 31, 2014, 907 employees in China were represented by unions, but we have never experienced a work stoppage. We consider our relations with our employees to be good.

Geographical Information

Please see Note 15 of our Notes to Consolidated Financial Statements for information regarding our foreign operations, and see “Risks related to international aspects of our business” under Item 1A. Risk Factors for further information on risks attendant to our foreign operations and dependence.

Available Information

Our principal executive offices are located at 4281 Technology Drive, Fremont, CA 94538, and our main telephone number at this address is (510) 683-5900. Our Internet website address is www.axt.com. Our website address is given solely for informational purposes; we do not intend, by this reference, that our website should be deemed to be part of this Annual Report on Form 10-K or to incorporate the information available at our Internet address into this Annual Report on Form 10-K.

We file electronically with the Securities and Exchange Commission, or SEC, our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended. We make these reports available free of charge through our Internet website as soon as reasonably practicable after we have electronically filed such material with the SEC. These reports can also be obtained from the SEC’s Internet website at www.sec.gov or at the SEC's Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549. The public may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330.

Item 1A. Risk Factors

For ease of reference, we have divided these risks and uncertainties into the following general categories:

Risks Related to Our General Business

Silicon substrates are significantly lower in cost compared to substrates made from specialty materials and new silicon-based technologies could allow silicon based substrates to replace specialty material based substrates for certain applications.

Historically silicon wafers or substrates are less expensive than specialty material substrates such as those that we produce. Electronic designers will generally consider silicon first and only turn to alternative materials if silicon cannot provide the required functionality in terms of power consumption, speed or other specifications. Beginning in 2011 certain applications that had previously used GaAs substrates adopted a new silicon-based technology called Silicon On Insulator, or SOI. SOI technology uses a silicon-insulator-silicon layered substrate in place of conventional silicon substrates in semiconductor manufacturing. SOI products cost less than GaAs substrates and although their performance is not as robust as GaAs substrates in terms of power consumption, heat generation and speed it is still acceptable in mobile phone and other applications that were previously dominated by GaAs substrates. The adoption of SOI has resulted in decreased GaAs wafer demand, and decreased revenue. If SOI or similar technologies gain more widespread market acceptance, or are used in more applications, our business and operating results could be significantly and adversely affected.

Underutilizing our manufacturing facilities may result in declines in our gross margins.

An important factor in our success is the extent to which we are able to utilize the available capacity in our manufacturing facilities. A number of factors and circumstances may reduce utilization rates, including periods of industry overcapacity, low levels of customer orders, operating inefficiencies, mechanical failures and disruption of operations due to expansion, power interruptions, fire, flood or other natural disasters or calamities. Because many portions of our manufacturing costs are relatively fixed, high utilization rates are critical to our gross margins and operating results. If we fail to achieve acceptable manufacturing volumes or experience product shipment delays, our

results of operations will be negatively affected. During periods of decreased demand, we have underutilized our manufacturing lines. If we are unable to improve utilization levels at our facilities during periods of decreased demand and correctly manage capacity, the fixed expense levels will have an adverse effect on our business, financial condition and results of operations. Our gross profit margins have fluctuated from period to period, and these fluctuations are expected to continue in the future. Within the last two years, our gross profit margin has fluctuated from 15.6% in the quarter ended March 31, 2013 to 25.4% for the quarter ended December 31, 2014.

In 2013, we concluded that incoming orders were insufficient and that we were significantly underutilizing our factory capacity. As a result, in February 2014, we announced a restructuring plan with respect to our wholly-owned subsidiary, Beijing Tongmei Xtal Technology Co, Ltd., or Tongmei, in order to better align manufacturing capacity with demand. Under the restructuring plan, we posted a charge of approximately $907,000 in first quarter of 2014.

If we receive fewer customer orders than forecasted or if our customers delay or cancel orders, we may not be able to reduce our manufacturing costs in the short-term and our gross margins would be negatively affected. In addition, lead times required by our customers are shrinking which reduces our ability to forecast orders and properly balance our capacity utilization.

Our gross margin has fluctuated historically and may decline due to several factors.

Our gross product margin has fluctuated from period to period as a result of shifts in product mix, the introduction of new products, decreases in average selling prices for products, utilization of our manufacturing capacity and our ability to reduce product costs. These fluctuations are expected to continue in the future.

We do not control the prices at which our subsidiaries and joint venture companies sell their raw materials products to third parties. However, as we consolidate the results of three of these companies with our own, any reduction in their gross margins could have a significant, adverse impact on our overall gross margins. One or more of our companies has in the past, and may in the future, sell raw materials at significantly reduced prices in order to gain volume sales or sales to new customers. In such an event, our gross margin may be adversely impacted. In addition, one of our consolidated subsidiaries has in the past been subject to capacity constraints requiring it to source product from other third party suppliers in order to meet customer demand, resulting in decreased gross margin and adversely impacting our gross margin. This joint venture may in the future continue to experience such capacity restraints, causing our gross margin, and consequently our operating results, to be adversely impacted.

Intense competition in the markets for our products could prevent us from increasing revenue and sustaining profitability.

The markets for our products are intensely competitive. We face competition for our substrate products from other manufacturers of substrates, such as Freiberger Compound Materials, JX, Umicore, Sumitomo Electric Industries and CCTC, from semiconductor device manufacturers that produce substrates for their own use, and from companies, such as TriQuint Semiconductors, RFMD and Skyworks that are actively developing alternative materials to GaAs and marketing semiconductor devices using these alternative materials. We believe that at least two of our major competitors are shipping high volumes of GaAs substrates manufactured using a technique similar to our VGF technology. Other competitors may develop and begin using similar technology. If we are unable to compete effectively, our revenue may not increase and we may be unable to remain profitable. We face many competitors that have a number of significant advantages over us, including:

Our competitors could develop new or enhanced products that are more effective than our products.

The level and intensity of competition has increased over the past years and we expect competition to continue to increase in the future. Competitive pressures have resulted in reductions in the prices of our products, and continued or increased competition could reduce our market share, require us to further reduce the prices of our products, affect our ability to recover costs and result in reduced gross margins.

In addition, new competitors have and may continue to emerge, such as a crystal growing company established by a former employee in China that is supplying semi-conducting GaAs wafers to the LED market. Competition from sources such as this could increase, particularly if these competitors are able to obtain large capital investments.

If we have low product yields, the shipment of our products may be delayed and our product cost and operating results may be adversely impacted.

A critical factor in our product cost is yield. Our products are manufactured using complex technologies, and the number of usable substrates we produce can fluctuate as a result of many factors, including:

In addition, we may modify our process to meet a customer specification but this can impact our yield. If our yields decrease, our revenue could decline if we are unable to produce product to our customers’ requirements. At the same time, our manufacturing costs could remain fixed, or could increase. We have experienced product shipment delays and difficulties in achieving acceptable yields on both new and older products, and delays and poor yields have adversely affected our operating results. We may experience similar problems in the future and we cannot predict when they may occur or their duration or severity.

If our manufacturing processes result in defects in our products making them unfit for use by our customers, our products would be rejected, resulting in compensation costs paid to our customers, and possible disqualification. This could lead to revenue loss and market share loss.

Problems incurred by our subsidiaries and joint ventures or venture partners could result in a material adverse impact on our financial condition or results of operations.

We have invested in subsidiaries and joint venture operations in China that produce products including 99.99% pure gallium (4N Ga), high purity gallium, arsenic, germanium, germanium dioxide, pyrolytic boron nitride (pBN) crucibles and boron oxide (B2O3). We purchase a portion of the materials produced by these companies for our use and they sell the remainder of their production to third parties. Our ownership and the ownership held by our consolidated subsidiaries in these entities ranges from 20% to 83%. We consolidate the companies in which we have a majority or controlling financial interest and employ equity accounting for the joint ventures in which we have a smaller ownership interest. Several of these joint ventures occupy space within larger facilities owned and/or operated by one of the other venture partners. Several of these venture partners are engaged in other manufacturing activities at or near the same facility. In some facilities, we share access to certain functions, including water, hazardous waste treatment or air quality treatment. If any of our joint venture partners in any of these ventures experiences problems with its operations, disruptions of our joint venture operations could result, having a material adverse effect on the financial condition and results of operation of our joint ventures, and correspondingly on our financial condition or results of operations. For example, since gallium is a by-product of aluminum, our gallium joint venture in China, which is housed in and receives services from an affiliated aluminum plant, could generate lower production of gallium as a result of reduced by-product services provided by the aluminum plant. Accordingly, in order to meet customer supply obligations, our joint venture may have to source materials from another independent third party supplier, resulting in reduced gross margin.

In addition, if any of our joint ventures or venture partners with which our joint ventures share facilities is deemed to have violated applicable laws, rules or regulations governing the use, storage, discharge or disposal of hazardous chemicals during manufacturing, research and development or sales demonstrations, the operations of our joint ventures could be adversely affected and we could be subject to substantial liability for clean-up efforts, personal injury and fines or suspension or cessation of our joint venture operations as a result of the actions of the joint ventures or other venture partners. Employees working for our joint ventures or any of the other venture partners could bring litigation against us as a result of actions taken at the joint venture or venture partner facilities, even

though we are not directly controlling the operations, including actions for exposure to chemicals or other hazardous materials at the facilities of our joint ventures or the facilities of any venture partner that are shared by our joint ventures. While we would expect to defend ourselves vigorously in any litigation that is brought against us, litigation is inherently uncertain and it is possible that our business, financial condition, results of operations or cash flows could be affected. Even if we are not deemed responsible for the actions of the joint ventures or venture partners, litigation could be costly, time consuming to defend and divert management attention; in addition, if we are deemed to be the most financially viable of the partners, plaintiffs may decide to pursue us for damages.

Since all of our joint venture activity occurs in China, these activities could subject us to a number of risks associated with conducting operations internationally, including:

Demand for our products may decrease if demand for the end-user applications decrease or if manufacturers downstream in our supply chain experience difficulty manufacturing, marketing or selling their products.

Our products are used as components in electronic products. Accordingly, demand for our products is subject to the demand for end-user applications which utilize our products, as well as factors affecting the ability of the manufacturers downstream in our supply chain to introduce and market their products successfully, including:

If demand for the end-user applications for which our products are used decreases, or if manufacturers downstream in our supply chain are unable to develop, market and sell their products, demand for our products will decrease.

The average selling prices of our products may decline over relatively short periods, which may reduce our gross margins.

The market for our products is characterized by declining average selling prices resulting from factors such as increased competition, overcapacity, the introduction of new products and decreased sales of products incorporating our products and as a result average selling prices for our products may decline over relatively short time periods. We have in the past experienced, and in the future may experience, substantial period-to-period fluctuations in operating results due to declining average selling prices. On average, for the year ended December 31, 2014 we experienced average selling price declines of approximately 5% to 10% depending on the product. It is possible that the pace of average selling price declines could accelerate beyond these levels for certain products in a commoditizing market. We anticipate that average selling prices will decrease in the future in response to the unstable demand environment, product introductions by competitors or us, or by other factors, including pricing pressures from significant customers. When our average selling prices decline, our gross profits decline unless we are able to

sell more products or reduce the cost to manufacture our products. We generally attempt to combat average selling price declines by improving yields, manufacturing efficiency and working to reduce the costs of our raw materials and of manufacturing our products. We have in the past and may in the future experience declining sales prices, which could negatively impact our revenues, gross profits and financial results. We therefore need to sell our current products in increasing volumes to offset any decline in their average selling prices, and introduce new products, which we may not be able to do, or do on a timely basis.

We may be unable to reduce the cost of our products sufficiently to enable us to compete with others. Our cost reduction efforts may not allow us to keep pace with competitive pricing pressures and could adversely affect our margins. In order to remain competitive, we must continually reduce the cost of manufacturing our products through design and engineering changes. We cannot assure you that any changes effected by us will result in sufficient cost reductions to allow us to reduce the price of our products to remain competitive or improve our gross margins.

Defects in our products could diminish demand for our products.

Our products are complex and may contain defects, including defects resulting from impurities inherent in our raw materials or inconsistencies in our manufacturing processes. We have experienced quality control problems with some of our products, which caused customers to return products to us, reduce orders for our products, or both. We believe that we continue to experience certain reduction in orders as a result of product quality issues. If we continue to experience quality control problems, or experience these or other problems in new products, customers may cancel or reduce orders or purchase products from our competitors and we may be unable to maintain or increase sales to our customers and sales of our products could decline. Defects in our products could cause us to incur higher manufacturing costs and suffer product returns and additional service expenses, all of which could adversely impact our operating results.

If new products developed by us contain defects when released, our customers may be dissatisfied and we may suffer negative publicity or customer claims against us, lose sales or experience delays in market acceptance of our new products.

The Chinese government has previously imposed manufacturing restrictions that, if imposed again in the future, could materially and adversely impact our results of operations and our financial condition.

The Chinese government has in the past imposed restrictions on manufacturing facilities, such as the restrictions imposed on polluting factories for the 2008 Olympics and the 2014 APEC event, including a shut-down of transportation of materials and power plants to reduce air pollution. If, in the future, restrictions are imposed that include our operations, our ability to supply current or new orders would be significantly impacted. Customers could then be required to purchase product from our competitors, causing our competitors to take market share from us. Restrictions on transportation of materials could limit our ability to transport our raw materials or products, and could result in bottlenecks at shipping ports, limiting our ability to deliver products to our customers. During periods of such restrictions, we may increase our stock of critical materials (such as arsenic, gallium, and other chemicals) for use during the period that these restrictions are likely to last, which will increase our use of cash and increase our inventory level, such as occurred during 2008. Any of these restrictions could materially and adversely impact our results of operations and our financial condition.

To reduce pollution in Beijing, the Chinese government has sometimes limited the addition or expansion of facilities by manufacturing companies in the Beijing area. If the government applied restrictions on us it could have an adverse impact on our results of operations and our financial condition.

The loss of one or more of our key substrate customers would significantly hurt our operating results.

Although no customer represented more than 10% of our revenue for the years ended December 31, 2013 and 2014, we expect that a significant portion of our future revenue will continue to be derived from a limited number of substrate customers. Most of our customers are not obligated to purchase a specified quantity of our products or to provide us with binding forecasts of product purchases. In addition, our customers may reduce, delay or cancel orders at any time without any significant penalty. In the past, we have experienced slower bookings, significant push-outs and cancellation of orders from customers. If we lose a major customer or if a customer cancels, reduces or delays orders, or reduces the prices paid for our products, our revenue would decline. In addition, customers that have accounted for significant revenue in the past may not continue to generate revenue for us in any future period. Any delay in scheduled shipments of our products could cause revenue to fall below our expectations and the expectations of market analysts or investors, causing our stock price to decline.

The cyclical nature of the semiconductor industry may limit our ability to maintain or increase net sales and operating results during industry downturns.

The semiconductor industry is highly cyclical and periodically experiences significant economic downturns characterized by diminished product demand, resulting in production overcapacity and excess inventory in the markets we serve. A downturn can result in lower unit volumes and rapid erosion of average selling prices. The semiconductor industry has experienced significant downturns, often in connection with, or in anticipation of, maturing product cycles of both semiconductor companies’ and their customers’ products or a decline in general economic conditions. This may adversely affect our results of operations and the value of our business.

Our continuing business depends in significant part upon manufacturers of electronic and opto-electronic compound semiconductor devices, as well as the current and anticipated market demand for these devices and products using these devices. As a supplier to the compound semiconductor industry, we are subject to the business cycles that characterize the industry. The timing, length and volatility of these cycles are difficult to predict. The compound semiconductor industry has historically been cyclical due to sudden changes in demand, the amount of manufacturing capacity and changes in the technology employed in compound semiconductors. The rate of changes in demand, including end demand, is high, and the effect of these changes upon us occurs quickly, exacerbating the volatility of these cycles. These changes have affected the timing and amounts of customers’ purchases and investments in new technology. These industry cycles create pressure on our revenue, gross margin and net income.

Our industry has in the past experienced periods of oversupply and that has resulted in significantly reduced prices for compound semiconductor devices and components, including our products, both as a result of general economic changes and overcapacity. When this occurs our operating results and financial condition are adversely affected. Oversupply causes greater price competition and can cause our revenue, gross margins and net income to decline. During periods of weak demand, customers typically reduce purchases, delay delivery of products and/or cancel orders of component parts such as our products. Further order cancellations, reductions in order size or delays in orders could occur and would materially adversely affect our business and results of operations. Actions to reduce our costs may be insufficient to align our structure with prevailing business conditions. We may be required to undertake additional cost-cutting measures, and may be unable to invest in marketing, research and development and engineering at the levels we believe are necessary to maintain our competitive position. Our failure to make these investments could seriously harm our business.

We base our planned operating expenses in part on our expectations of future revenue, and a significant portion of our expense is relatively fixed. If revenue for a particular quarter is lower than we expect, we likely will be unable to proportionately reduce our operating expenses for that quarter, which would harm our operating results. For example, in 2013, we experienced significantly declining gross margins due to the allocation of fixed costs across a lower volume of sales than anticipated.

We purchase critical raw materials and parts for our equipment from single or limited sources, and could lose sales if these sources fail to fill our needs.

We depend on a limited number of suppliers for certain raw materials, components and equipment used in manufacturing our products, including key materials such as quartz tubing from our vendor, Kaide, and polishing solutions. Although several of these raw materials are purchased from suppliers in which we hold an ownership interest, we generally purchase these materials through standard purchase orders and not pursuant to long-term supply contracts, and no supplier guarantees supply of raw materials or equipment to us. If we lose any of our key suppliers, our manufacturing efforts could be significantly hampered and we could be prevented from timely producing and delivering products to our customers. Prior to investing in our subsidiaries and joint ventures, we sometimes experienced delays obtaining critical raw materials and spare parts, including gallium, due to shortages of these materials and we could experience such delays again in the future due to shortages of materials and may be unable to obtain an adequate supply of materials. These shortages and delays could result in higher materials costs and cause us to delay or reduce production of our products. If we have to delay or reduce production, we could fail to meet customer delivery schedules and our revenue and operating results could suffer.

If we do not successfully develop new products to respond to rapidly changing customer requirements, our ability to generate revenue, obtain new customers, and retain existing customers may suffer.

Our success depends on our ability to offer new products and product features that incorporate leading technology and respond to technological advances. In addition, our new products must meet customer needs and compete effectively on quality, price and performance. The life cycles of our products are difficult to predict. The

markets for our products are characterized by rapid technological change, changing customer needs and evolving industry standards. If our competitors introduce products employing new technologies or performance characteristics, our existing products could become obsolete and unmarketable. During the past few years, we have seen our competitors selling more substrates manufactured using a crystal growth technology similar to ours, which has eroded our technological differentiation.

The development of new products can be a highly complex process, and we may experience delays in developing and introducing new products. Any significant delay could cause us to fail to timely introduce and gain market acceptance of new products. Further, the costs involved in researching, developing and engineering new products could be greater than anticipated. If we fail to offer new products or product enhancements or fail to achieve higher quality products, we may not generate sufficient revenue to offset our development costs and other expenses or meet our customers’ requirements.

Our substrate products have a long qualification cycle that makes it difficult to plan our expenses and forecast our results.

New customers typically place orders with us for our substrate products three months to a year or more after our initial contact with them. The sale of our products may be subject to delays due to our customers’ lengthy internal approval and evaluation processes. During this time, we may incur substantial expenses and expend sales, marketing and management efforts while the customers evaluate our products. These expenditures may not result in sales of our products. If we do not achieve anticipated sales in a period as expected, we may experience an unplanned shortfall in our revenue. As a result, we may not be able to cover expenses, causing our operating results to be adversely effected. In addition, if we fail to meet the product qualification requirements of the customer, we may not have another opportunity to sell products to this customer for many months or even years. In the current competitive climate, the average qualification and sales cycle for our products has lengthened even further and is expected to continue to make it difficult for us to forecast our future sales accurately. We anticipate that sales of any future substrate products will also have lengthy sales cycles and will, therefore, be subject to risks substantially similar to those inherent in the lengthy sales cycles of our current substrate products.

If any of our facilities are damaged by occurrences such as fire, explosion or natural disaster, we might not be able to manufacture our products.

The ongoing operation of our manufacturing and production facilities in China is critical to our ability to meet demand for our products. If we are not able to use all or a significant portion of our facilities for prolonged periods for any reason, we would not be able to manufacture products for our customers. For example, a fire or explosion caused by our use of combustible chemicals and high temperatures during our manufacturing processes or power interruption caused by severe weather conditions could render some or all of our facilities inoperable for an indefinite period of time. Actions outside of our control, such as earthquakes or other natural disasters, could also damage our facilities, rendering them inoperable. If we are unable to operate our facilities and manufacture our products, we would lose customers and revenue and our business would be harmed.

The financial condition of our customers may affect their ability to pay amounts owed to us.

Many of our customers are undercapitalized and cope with cash flow issues. We frequently allow our customers extended payment terms after shipping products to them. Subsequent to our shipping a product, some customers have been unable to make payments when due, reducing our cash balances and causing us to incur charges to allow for a possibility that some accounts might not be paid. Customers may also be forced to file for bankruptcy. If our customers do not pay their accounts we will be required to incur charges that would reduce our earnings.

We have made and may continue to make strategic investments in raw materials suppliers, which may not be successful and may result in the loss of all or part of our investment.

We have made investments through our subsidiaries and joint ventures in raw material suppliers in China, which provide us with opportunities to gain supplies of key raw materials that are important to our substrate business. These affiliates each have a market beyond that provided by us. We do not have influence over all of these companies and in some we have made only a strategic, minority investment. We may not be successful in achieving the financial, technological or commercial advantage upon which any given investment is premised, and we could end up losing all or part of our investment.

We depend on the continuing efforts of our senior management team and other key personnel. If we lose members of our senior management team or other key personnel, or are unable to successfully, recruit and train qualified personnel, our ability to manufacture and sell our products could be harmed.

Our future success depends on the continuing services of members of our senior management team and other key personnel. Our industry is characterized by high demand and intense competition for talent, and the turnover rate can be high. We compete for qualified management and other personnel with other semiconductor companies. Our employees could leave our company with little or no prior notice and would be free to work for a competitor. If one or more of our senior executives or other key personnel were unable or unwilling to continue in their present positions, we may not be able to replace them easily or at all, and other senior management may be required to divert attention from other aspects of the business. The loss of any of these individuals or our ability to attract or retain qualified personnel could adversely affect our business.

Our results of operations may suffer if we do not effectively manage our inventory.

We must manage our inventory of raw materials, work-in-process and finished goods effectively to meet changing customer requirements, while keeping inventory costs down and improving gross margins. Although we seek to maintain sufficient inventory levels of certain materials to guard against interruptions in supply and to meet our near term needs, and have to date been able to obtain sufficient supplies of materials in a timely manner, in the future, we may experience shortages of certain key materials. Some of our products and supplies have in the past and may in the future become obsolete while in inventory due to changing customer specifications, or become excess inventory due to decreased demand for our products and an inability to sell the inventory within a foreseeable period. Furthermore, if market prices drop below the prices at which we value inventory, we may need to take a charge for a reduction in inventory values. We have in the past had to take inventory valuation and impairment charges. Any future unexpected changes in demand or increases in costs of production that cause us to take additional charges for un-saleable, obsolete or excess inventory, or to reduce inventory values, could adversely affect our results of operations.

Financial market volatility and adverse changes in the domestic and global economic environment could have a significant adverse impact on our business, financial condition and operating results.

We are subject to the risks arising from adverse changes and uncertainty in domestic and global economies. Uncertain global economic conditions and low or negative growth in China, Europe and the United States, along with volatility in the financial markets, increasing national debt and fiscal concerns in various regions, pose challenges to our industry. Although we remain well-capitalized, the cost and availability of funds may be adversely affected by illiquid credit markets. Turbulence in U.S. and international markets and economies may adversely affect our liquidity, financial condition and profitability. Another severe or prolonged economic downturn could result in a variety of risks to our business, including:

In the recent past we experienced delays in customer purchasing decisions and disruptions in normal volume of customer orders that we believe were in part due to the uncertainties in the global economy and an adverse impact on consumer spending. During challenging and uncertain economic times and in tight credit markets, many customers delay or reduce technology purchases. Should similar events occur again, our business and operating results could be significantly and adversely affected.

Global economic conditions may have an impact on our business and financial condition in ways that we currently cannot predict.

Our operations and financial results depend on worldwide economic conditions and their impact on levels of business spending, which had deteriorated significantly in many countries and regions in previous years.

Uncertainties in the financial and credit markets may cause our customers to postpone deliveries of ordered systems and placement of new orders and extended uncertainties may reduce future sales of our products and services. The revenue growth and profitability of our business depends on the overall demand for our substrates, and we are particularly dependent on the market conditions for the wireless, solid state illumination, fiber optics and telecommunications industries. Because the end users of our products are primarily large companies whose businesses fluctuate with general economic and business conditions, a softening of demand for products that use our substrates, caused by a weakening economy, may result in decreased revenue. Customers may find themselves facing excess inventory from earlier purchases, and may defer or reconsider purchasing products due to the downturn in their business and in the general economy. If market conditions deteriorate, we may experience increased collection times and greater write-offs, either of which could have a material adverse effect on our profitability and our cash flow.

Future tightening of credit markets and concerns regarding the availability of credit may make it more difficult for our customers to raise capital, whether debt or equity, to finance their purchases of capital equipment or of the products we sell. Delays in our customers’ ability to obtain such financing, or the unavailability of such financing, would adversely affect our product sales and revenues and therefore harm our business and operating results. We cannot predict the timing, duration of or effect on our business of any future economic downturn or the timing or strength of any subsequent recovery.

We may not be able to identify additional complementary joint ventures.

We believe that continuing to invest in additional joint ventures will be important to remaining competitive in our marketplace and ensuring a supply of critical raw materials. However, we may not be able to identify additional complementary joint venture opportunities or, even once opportunities are identified, we may not be able to reach agreement on the terms of the venture with the other venture partners. Additional joint ventures could cause us to incur contingent liabilities or other expenses, any of which could adversely affect our financial condition and operating results.

The effect of terrorist threats and actions on the general economy could decrease our revenue.

Developed countries such as the United States and China continue to be on alert for terrorist activity. The potential near- and long-term impact terrorist activities may have in regards to our suppliers, customers and markets for our products and the economy is uncertain. There may be embargos of ports or products, or destruction of shipments or our facilities, or attacks that affect our personnel. There may be other potentially adverse effects on our operating results due to significant events that we cannot foresee. Since we perform all of our manufacturing operations in China, terrorist activity or threats against U.S.-owned enterprises are a particular concern to us.

Risks Related to International Aspects of Our Business

We derive a significant portion of our revenue from international sales, and our ability to sustain and increase our international sales involves significant risks.

Our revenue growth depends in part on the expansion of our international sales and operations. International sales represented 88% of our revenue in 2014 and 2013 and 83% of our revenue in 2012. We expect that sales to customers outside the United States, particularly sales to customers in Japan, Taiwan and China, will continue to represent a significant portion of our revenue.

Currently, a significant percentage of our revenue is to customers headquartered in Asia. All of our manufacturing facilities and most of our suppliers are also located outside the United States. Managing our overseas operations presents challenges, including periodic regional economic downturns, trade balance issues, varying business conditions and demands, political instability, variations in enforcement of intellectual property and contract rights in different jurisdictions, differences in the ability to develop relationships with suppliers and other local businesses, changes in U.S. and international laws and regulations including U.S. export restrictions, fluctuations in interest and currency exchange rates, the ability to provide sufficient levels of technical support in different locations, cultural differences, shipping delays and terrorist acts or acts of war, among other risks. Many of these challenges are present in China, which represents a large potential market for semiconductor devices. Global uncertainties with respect to: (i) economic growth rates in various countries; (ii) sustainability of demand for electronics products; (iii) capital spending by semiconductor manufacturers; (iv) price weakness for certain semiconductor devices; and (v) political instability in regions where we have operations may also affect our business, financial condition and results of operations.

Our dependence on international sales involves a number of risks, including:

Our sales are denominated in U.S. dollars, except for sales to our Chinese customers which are denominated in Renminbi and our Japanese customers which are denominated in Japanese yen. Increases in the value of the U.S. dollar could increase the price of our products in non-U.S. markets and make our products more expensive than competitors’ products in these markets.

Denominating some sales in Japanese yen subjects us to fluctuations in the exchange rates between the U.S. dollar and the Japanese yen. For example, in the second half of 2014, the exchange rate of Japanese yen to U.S. dollar moved from 101.55 to 119.95 from June 30, 2014 to December 31, 2014. We incurred foreign currency transaction exchange losses which are included in “other income (expense), net” on the consolidated statements of operations of $1.0 million, $1.3 million and $445,000 for the years ended December 31, 2014, 2013 and 2012 respectively. The functional currency of our Chinese subsidiary and joint ventures is the local currency. We incur transaction gains or losses resulting from consolidation of expenses incurred in local currencies for these entities, as well as in translation of the assets and liabilities of their assets at each balance sheet date. If we do not effectively manage the risks associated with international sales, our revenue, cash flows and financial condition could be adversely affected.

Changes in tariffs, import or export restrictions, Chinese regulations or other trade barriers may reduce gross margins.

We may incur increases in costs due to changes in tariffs, import or export restrictions, or other trade barriers, unexpected changes in regulatory requirements, any of which could reduce our gross margins. For example, in July 2012, we received notice of retroactive value-added taxes (VATs) levied by the tax authorities in China which applied for the period from July 1, 2011 to June 30, 2012. We expensed the retroactive VATs of approximately $1.3 million in the quarter ended June 30, 2012, which resulted in a decrease in our gross margins. These VATs will continue to negatively impact our gross margins for the future quarters. Given the relatively fluid regulatory environment in China, there could be additional tax or other regulatory changes in the future. Any such changes could directly and materially adversely impact our financial results and general business condition.

Our operating results depend in large part on continued customer acceptance of our substrate products manufactured in China and continued improvements in product quality.

We manufacture all of our products in China, and source most of our raw materials in China. We have in the past experienced quality problems with our China-manufactured products. Our previous quality problems caused us to lose market share to our competitors, as some customers reduced their orders from us until our surface quality was as good and consistent as that offered by competitors and instead allocated their requirements for compound semiconductor substrates to our competitors. If we are unable to continue to achieve customer qualifications for our products, or if we continue to experience quality problems, customers may not increase purchases of our products, our China facility will become underutilized, and we will be unable to achieve revenue growth.

Changes in China’s political, social and economic environment may affect our financial performance.

Our financial performance may be affected by changes in China’s political, social and economic environment. The role of the Chinese central and local governments in the Chinese economy is significant. Chinese policies toward economic liberalization, and laws and policies affecting technology companies, foreign investment, currency exchange rates, taxation structure and other matters could change, resulting in greater restrictions on our ability to do business and operate our manufacturing facilities in China. Any imposition of surcharges or any increase in Chinese tax rates or reduction or elimination of Chinese tax benefits could hurt our operating results. The Chinese

government could revoke, terminate or suspend our operating license for national security and similar reasons without compensation to us. If the Chinese government were to take any of these actions, we would be prevented from conducting all or part of our business. Any failure on our part to comply with governmental regulations could result in the loss of our ability to manufacture our products in China.

If there are power shortages in China, we may have to temporarily close our China operations, which would adversely impact our ability to manufacture our products and meet customer orders, and would result in reduced revenue.

In the past, China has faced power shortages resulting in power demand outstripping supply in peak periods. Instability in electrical supply has caused sporadic outages among residential and commercial consumers causing the Chinese government to implement tough measures to ease the energy shortage. If further problems with power shortages occur in the future, we may be required to make temporary closures of our subsidiary and joint venture operations. We may be unable to manufacture our products and would then be unable to meet customer orders except from inventory on hand. As a result, our revenue could be adversely impacted, and our relationships with our customers could suffer, impacting our ability to generate future revenue. In addition, if power is shut off at the facilities for our China joint ventures at any time, either voluntarily or as a result of unplanned brownouts, during certain phases of our manufacturing process including our crystal growth phase, the work in process may be ruined and rendered unusable, causing us to incur costs that will not be covered by revenue, and negatively impacting our cost of revenue and gross margins.

An outbreak of a contagious disease such as Ebola, Severe Acute Respiratory Syndrome (SARS) or the Avian Flu may adversely impact our manufacturing operations and some of our key suppliers and customers.

Any reoccurrence of SARS or an outbreak of a contagious disease, such as Avian Flu, or Ebola, may cause us to temporarily close our manufacturing operations. Similarly, if one or more of our key suppliers is required to close for an extended period, we might not have enough raw material inventories to continue manufacturing operations. In addition, while we possess management skills among our China staff that enable us to maintain our manufacturing operations with minimal on-site supervision from our U.S.-based staff, our business could also be harmed if travel to or from China and the United States is restricted or inadvisable. If our manufacturing operations were closed for a significant period, we could lose revenue and market share, which would depress our financial performance and could be difficult to recapture. Finally, if one of our key customers is required to close for an extended period, we might not be able to ship product to them, our revenue would decline and our financial performance would suffer.

Risks Related to Our Financial Results and Capital Structure

If we fail to manage periodic contractions, we may utilize our cash balances, resulting in the decline of our existing cash, cash equivalents and investment balances.

We anticipate that our existing cash resources will fund our operations and purchases of capital equipment, as well as provide adequate working capital for the next twelve months. However, our liquidity is affected by many factors including, among others, the extent to which we pursue additional capital expenditures, the level of our production, and other factors related to the uncertainties of the industry and global economies. If we fail to manage business contractions successfully we may draw down our cash reserves, which would adversely affect our financial condition, reduce our value and possibly impinge our ability to raise debt and equity funding in the future, at a time when we might need to raise additional cash. Accordingly, there can be no assurance that events in the future will not require us to seek additional capital or, if required, that such capital would be available on terms acceptable to us, if at all. As part of our effort to reduce costs, we may lose key staff, production resources and technology that we will need to replenish when end markets recover. These events could reduce our ability to grow profitably as markets recover.

Unpredictable fluctuations in our operating results could disappoint analysts or our investors, which could cause our stock price to decline.

We have experienced, and may continue to experience, significant fluctuations in our revenue and earnings. Our quarterly and annual revenue and operating results have varied significantly in the past and may vary significantly in the future due to a number of factors, including:

Due to these factors, we believe that period-to-period comparisons of our operating results may not be meaningful indicators of our future performance.

A substantial percentage of our operating expenses are fixed, and we may be unable to adjust spending to compensate for an unexpected shortfall in revenue. As a result, any delay in generating revenue could cause our operating results to fall below the expectations of market analysts or investors, which could also cause our stock price to decline.

If our operating results and financial performance do not meet the guidance that we have provided to the public, our stock price may decline.

We provide public guidance on our expected operating and financial results. Although we believe that this guidance provides our stockholders, investors and analysts with a better understanding of our expectations for the future, such guidance is comprised of forward-looking statements subject to the risks and uncertainties described in this report and in our other public filings and public statements. Our actual results may not meet the guidance we have provided. If our operating or financial results do not meet our guidance or the expectations of investment analysts, our stock price may decline.

We have adopted certain anti-takeover measures that may make it more difficult for a third party to acquire us.

Our board of directors has the authority to issue up to 2,000,000 shares of preferred stock and to determine the price, rights, preferences and privileges of those shares without any further vote or action by the stockholders. The rights of the holders of common stock will be subject to, and may be adversely affected by, the rights of the holders of any preferred stock that may be issued in the future. The issuance of shares of preferred stock could have the effect of making it more difficult for a third party to acquire a majority of our outstanding voting stock. We have no present intention to issue additional shares of preferred stock.

Provisions in our amended and restated certificate of incorporation and amended and restated bylaws may have the effect of delaying or preventing a merger, acquisition or change of control, or changes in our management, which could adversely affect the market price of our common stock. The following are some examples of these provisions:

Furthermore, because we are incorporated in Delaware, we are subject to the provisions of Section 203 of the Delaware General Corporation Law. These provisions prohibit us from engaging in any business combination with

any interested stockholder (a stockholder who owns 15% or more of our outstanding voting stock) for a period of three years following the time that such stockholder became an interested stockholder, unless:

Our common stock may be delisted from The Nasdaq Global Select Market, which could negatively impact the price of our common stock and our ability to access the capital markets.

Our common stock is listed on The Nasdaq Global Select Market. The bid price of our common stock has in the past closed below the $1.00 minimum per share bid price required for continued inclusion on The Nasdaq Global Select Market under Marketplace Rule 5450(a). If the bid price of our common stock remains below $1.00 per share for thirty consecutive business days, we could be subject to delisting from the Nasdaq Global Select Market.

Any delisting from The Nasdaq Global Select Market could have an adverse effect on our business and on the trading of our common stock. If a delisting of our common stock were to occur, our common stock would trade on the OTC Bulletin Board or on the “pink sheets” maintained by the National Quotation Bureau, Inc. Such alternatives are generally considered to be less efficient markets, and our stock price, as well as the liquidity of our common stock, may be adversely impacted as a result. Delisting from The Nasdaq Global Select Market could also have other negative results, including the potential loss of confidence by suppliers and employees, the loss of institutional investor interest and fewer business development opportunities, as well as the loss of liquidity for our stockholders.

Risks Related to Our Intellectual Property

Intellectual property infringement claims may be costly to resolve and could divert management attention.

Other companies may hold or obtain patents on inventions or may otherwise claim proprietary rights to technology necessary to our business. The markets in which we compete are comprised of competitors that in some cases hold substantial patent portfolios covering aspects of products that could be similar to ours. We could become subject to claims that we are infringing patent, trademark, copyright or other proprietary rights of others. We have in the past been involved in lawsuits alleging patent infringement, and could in the future be involved in similar litigation. For example, we entered into a settlement agreement with Sumitomo Electric Industries in 2011 to settle a claim of patent infringement.

If we are unable to protect our intellectual property, we may lose valuable assets or incur costly litigation.

We rely on a combination of patents, copyrights, trademark and trade secret laws, non-disclosure agreements and other intellectual property protection methods to protect our proprietary technology. However, we believe that, due to the rapid pace of technological innovation in the markets for our products, our ability to establish and maintain a position of technology leadership also depends on the skills of our development personnel. Despite our efforts to protect our intellectual property, third parties can develop products or processes similar to ours. Our means of protecting our proprietary rights may not be adequate, and our competitors may independently develop similar technology, duplicate our products or design around our patents. We believe that at least two of our competitors have begun to ship GaAs substrates produced using a process similar to our VGF process. Our competitors may also develop and patent improvements to the VGF technology upon which we rely, and thus may limit any exclusivity we enjoy by virtue of our patents or trade secrets.

It is possible that pending or future United States or foreign patent applications made by us will not be approved, that our issued patents will not protect our intellectual property, or that third parties will challenge our ownership rights or the validity of our patents. In addition, the laws of some foreign countries may not protect our proprietary rights to as great an extent as do the laws of the United States and it may be more difficult to monitor the use of our intellectual property. Our competitors may be able to legitimately ascertain non-patented proprietary technology embedded in our systems. If this occurs, we may not be able to prevent the development of technology substantially similar to ours.

We may have to resort to costly litigation to enforce our intellectual property rights, to protect our trade secrets or know-how or to determine their scope, validity or enforceability. Enforcing or defending our proprietary

technology is expensive, could cause us to divert resources and may not prove successful. Our protective measures may prove inadequate to protect our proprietary rights, and if we fail to enforce or protect our rights, we could lose valuable assets.

Risks Related to Compliance and Other Legal Matters

We need to continue to improve or implement our systems, procedures and controls.

Our operations in China and our efforts to grow our business place a significant strain on our operations and management resources. We rely on certain manual processes in our operations and in connection with consolidation of our financial results. If we fail to manage these operations or fail to effectively manage a transition from manual processes to automated processes, our operations may be disrupted.

To manage our business effectively, we may need to implement additional management information systems, further develop our operating, administrative, financial and accounting systems and controls, add experienced senior level managers, and maintain close coordination among our executive, engineering, accounting, marketing, sales and operations organizations.

We are subject to internal control evaluations and attestation requirements of Section 404 of the Sarbanes-Oxley Act.

Pursuant to Section 404 of the Sarbanes-Oxley Act of 2002, we must include in our Annual Report on Form 10-K a report of management on the effectiveness of our internal control over financial reporting. Ongoing compliance with this requirement is complex, costly and time-consuming. If: (1) we fail to maintain effective internal control over financial reporting; or (2) our management does not timely assess the adequacy of such internal control, we could be subject to regulatory sanctions and the public’s perception of us may be adversely impacted.

If we fail to comply with environmental and safety regulations, we may be subject to significant fines or forced to cease our operations; in addition, we could be subject to suits for personal injuries caused by hazardous materials.

We are subject to federal, state and local environmental and safety laws and regulations in all of our operating locations, including laws and regulations of China, such as laws and regulations related to the development, manufacture and use of our products, the operation of our facilities, and the use of our real property. These laws and regulations govern the use, storage, discharge and disposal of hazardous chemicals during manufacturing, research and development, and sales demonstrations. If we fail to comply with applicable regulations, we could be subject to substantial liability for clean-up efforts, personal injury and fines or suspension or be forced to cease our operations, and/or suspend or terminate the development, manufacture or use of certain of our products, the use of our facilities, or the use of our real property, each of which could have a material adverse effect on our business, financial condition and results of operations.

For example, in 2005, a complaint was filed against us alleging personal injury, general negligence, intentional tort, wage loss and other damages, including punitive damages, as a result of exposure of plaintiffs to high levels of gallium arsenide in gallium arsenide wafers, and methanol. Other current and/or former employees could bring litigation against us in the future. Although we have put in place engineering, administrative and personnel protective equipment programs to address these issues, our ability to expand or continue to operate our present locations could be restricted or we could be required to acquire costly remediation equipment or incur other significant expenses if we were found liable for failure to comply with environmental and safety regulations. Existing or future changes in laws or regulations in the United States and China may require us to incur significant expenditures or liabilities, or may restrict our operations. In addition, our employees could be exposed to chemicals or other hazardous materials at our facilities and we may be subject to lawsuits seeking damages for wrongful death or personal injuries allegedly caused by exposure to chemicals or hazardous materials at our facilities.

Litigation is inherently uncertain and while we would expect to defend ourselves vigorously, it is possible that our business, financial condition, results of operations or cash flows could be affected in any particular period by litigation pending and any additional litigation brought against us. In addition, future litigation could divert management’s attention from our business and operations, causing our business and financial results to suffer. We could incur defense or settlement costs in excess of the insurance covering these litigation matters, or that could result in significant judgments against us or cause us to incur costly settlements, in excess of our insurance limits.

Item 1B. Unresolved Staff Comments

None.

Item 2. Properties

Our principal properties as of February 28, 2015 are as follows:

We consider each facility to be in good operating condition and adequate for its present use, and believe that each facility has sufficient plant capacity to meet its current and anticipated operating requirements.

Item 3. Legal Proceedings

From time to time we may be involved in judicial or administrative proceedings concerning matters arising in the ordinary course of business. We do not expect that any of these matters, individually or in the aggregate, will have a material adverse effect on our business, financial condition, cash flows or results of operation.

Item 4. Mine Safety Disclosures

Not applicable.

PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Our common stock has been trading publicly on the NASDAQ Global Market (NASDAQ) under the symbol “AXTI” since May 20, 1998, the date we consummated our initial public offering, and beginning on January 3, 2011, our common stock began trading on the NASDAQ Global Select Market under the same symbol. The following table sets forth the range of high and low sales prices of the common stock for the periods indicated, as reported by NASDAQ.

As of March 3, 2015, there were 75 holders of record of our common stock. Because many shares of AXT’s common stock are held by brokers and other institutions on behalf of stockholders, we are unable to estimate the total number of beneficial owners of our common stock.

We have never paid or declared any cash dividends on our common stock and do not anticipate paying cash dividends in the foreseeable future. Dividends accrue on our outstanding Series A preferred stock at the rate of $0.20 per annum per share of Series A preferred stock. The 883,000 shares of $0.001 par value Series A preferred stock issued and outstanding as of both December 31, 2014 and 2013 are valued at $3,532,000 and are non-voting and non-convertible preferred stock with a 5.0% cumulative annual dividend rate payable when declared by our board of directors, and $4 per share liquidation preference over common stock, and must be paid before any distribution is made to common stockholders. These preferred shares were issued to Lyte Optronics, Inc. stockholders in connection with the completion of our acquisition of Lyte Optronics, Inc. on May 28, 1999.

Issuer Purchases of Equity Securities

On October 27, 2014, our Board of Directors approved a stock repurchase program pursuant to which we may repurchase up to $5.0 million of our outstanding common stock. These purchases can be made from time to time in the open market and are funded from our existing cash balances and cash generated from operations.

On February 21, 2013, our Board of Directors approved a stock repurchase program pursuant to which we could repurchase up to $6.0 million of our outstanding common stock through February 27, 2014. The purchases could be made from time to time in the open market and were to be funded from our existing cash balances and cash generated from operations. During 2013, we repurchased approximately 285,000 shares at an average price of $2.52 per share for a total purchase price of $716,000 under the stock repurchase program. As of December 31, 2013, approximately $5.3 million remained available for future repurchases under this program. No shares were repurchased in 2014 under this program and the plan expired on February 27, 2014.

During three months ended December 31, 2014, we did not repurchase any shares of our common stock. During the year ended December 31, 2014, we did not repurchase any shares of our common stock.

Comparison of Stockholder Return

Set forth below is a line graph comparing the annual percentage change in the cumulative total return to the stockholders of the Company on our common stock with the CRSP Total Return Index for the Nasdaq Stock Market (U.S. Companies) and the Nasdaq Electronic Components Index for the period commencing December 31, 2009 and ending December 31, 2014.

Item 6. Selected Consolidated Financial Data

The following selected consolidated financial data is derived from and should be read in conjunction with our consolidated financial statements and related notes set forth in Item 8 below, and in our previously filed reports on Form 10-K. See also Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” for further information relating to items reflecting our results of operations and financial condition.

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

In addition to historical information, the following discussion contains forward-looking statements that are subject to risks and uncertainties. Actual results may differ substantially from those referred to herein due to a number of factors, including but not limited to risks described in the section entitled Item 1A. “Risk Factors” and elsewhere in this Annual Report. This discussion should be read in conjunction with Item 6. “Selected Consolidated Financial Data” and our consolidated financial statements and related notes included elsewhere in this Form 10-K.

On August 11, 2014, we announced the appointment of Mr. Gary L. Fischer as the Company’s Vice President, Chief Financial Officer and Corporate Secretary, effective as of August 11, 2014. Dr. Morris S. Young, Chief Executive Officer of the Company relinquished his role as Interim Chief Financial Officer and Corporate Secretary of the Company, effective as of August 11, 2014.

Restructuring Charges

On February 25, 2014, we announced a restructuring plan with respect to our wholly-owned subsidiary, Beijing Tongmei Xtal Technology Co, Ltd., or Tongmei, in order to better align manufacturing capacity with demand. Under the restructuring plan, Tongmei implemented certain workforce reductions with respect to its manufacturing facility in China. We reduced the workforce at Tongmei by approximately 93 positions that were no longer required to support production and operations, or approximately 11 percent of our workforce. We recorded a restructuring charge of approximately $907,000 related to the reduction in force for severance-related expenses. This restructuring plan and reduction in force has been completed as of March 31, 2014.

Critical Accounting Policies and Estimates

We prepare our consolidated financial statements in accordance with accounting principles generally accepted in the United States of America. Accordingly, we make estimates, assumptions and judgments that affect the amounts reported on our consolidated financial statements. These estimates, assumptions and judgments about future events and their effects on our results cannot be determined with certainty, and are made based upon our historical experience and on other assumptions that are believed to be reasonable under the circumstances. These estimates may change as new events occur or additional information is obtained, and we may periodically be faced with uncertainties, the outcomes of which are not within our control and may not be known for a prolonged period of time.

We have identified the policies below as critical to our business operations and understanding of our financial condition and results of operations. Critical accounting policies are material to the presentation of our consolidated financial statements and require us to make difficult, subjective or complex judgments that could have a material effect on our financial condition and results of operations. They may require us to make assumptions about matters that are highly uncertain at the time of the estimate. Different estimates that we could have used, or changes in the estimate that are reasonably likely to occur, may have a material impact on our financial condition or results of operations. We also refer you to Note 1 to our consolidated financial statements included elsewhere in this Form 10-K.

Revenue Recognition

We manufacture and sell high-performance compound semiconductor substrates and sell certain raw materials including gallium, germanium dioxide, and pBN crucibles. After we ship our products, there are no remaining obligations or customer acceptance requirements that would preclude revenue recognition. Our products are typically sold pursuant to a purchase order placed by our customers, and our terms and conditions of sale do not require customer acceptance. We recognize revenue upon shipment and transfer of title of products to our customers, which is either upon shipment from our dock, receipt at the customer’s dock, or removal from consignment inventory at the customer’s location, provided that we have received a signed purchase order, the price is fixed or determinable, title and risk of ownership have transferred, collection of resulting receivables is probable, and product returns are reasonably estimable. We do not provide training, installation or commissioning services.

We provide for future returns based on historical experience, current economic trends and changes in customer demand at the time revenue is recognized.

Accounts Receivable, Allowance for Doubtful Accounts and Allowance for sales returns

We periodically review the likelihood of collection on our accounts receivable balances and provide an allowance for doubtful accounts receivable primarily based upon the age of these accounts. We evaluate receivables from U.S. customers with an emphasis on balances in excess of 90 days and for receivables from customers located outside the U.S. with an emphasis on balances in excess of 120 days and establish a reserve on the receivable balances if needed. The reason for the difference in the evaluation of receivables between foreign and U.S. customers is that U.S. customers have historically made payments in a shorter period of time than foreign customers. Foreign business practices generally require us to allow customer payment terms that are longer than those accepted in the United States. We assess the probability of collection based on a number of factors, including the length of time a receivable balance has been outstanding, our past history with the customer and their creditworthiness.

As of December 31, 2014 and December 31, 2013, our accounts receivable, net balance was $17.9 million and $14.9 million, respectively, which was net of an allowance for doubtful accounts of $410,000 and $869,000, respectively. During 2014, we decreased this allowance for doubtful accounts by $459,000 primarily for improved collections worldwide. During 2013 we increased our allowance for doubtful accounts by $869,000 primarily because of the poor financial condition of a few customers in China. No amounts have been written off. If actual uncollectible accounts differ substantially from our estimates, revisions to the estimated allowance for doubtful accounts would be required, which could have a material impact on our financial results for future periods.

The allowance for sales returns is also deducted from gross accounts receivable. During 2014, we utilized $410,000 and charged an additional $183,000 resulting in the allowance for sales returns of $413,000 as of December 31, 2014. During 2013, we utilized $189,000 and charged an additional $130,000 resulting in the allowance for sales returns of $186,000 as of December 31, 2013. During 2012, we utilized $426,000 and charged an additional $547,000 resulting in the allowance for sales returns of $245,000 as of December 31, 2012.

Warranty Reserve

We maintain a warranty reserve based upon our claims experience during the prior 12 months. Warranty costs are accrued at the time revenue is recognized. As of December 31, 2014 and 2013, accrued product warranties totaled $802,000 and $1.0 million, respectively. The decrease in accrued product warranties is primarily attributable to decreased claims for quality issues experienced by some customers. If actual warranty costs differ substantially from our estimates, revisions to the estimated warranty liability would be required, which could have a material impact on our financial condition and results of operations for future periods.

Inventory Valuation

Inventories are stated at the lower of cost or market. Cost is determined using the weighted average cost method. Our inventory consists of raw materials as well as finished goods and work-in-process that include material, labor and manufacturing overhead costs. Given the nature of our substrate products, and the materials used in the manufacturing process, the wafers and ingots comprising work-in-process may be held in inventory for up to two years and three years, respectively, as the risk of obsolescence for these materials is low. We routinely evaluate the levels of our inventory in light of current market conditions in order to identify excess and obsolete inventory, and we provide a valuation allowance for certain inventories based upon the age and quality of the product and the projections for sale of the completed products. As of December 31, 2014 and 2013, we had an inventory reserve of $11.2 million and $11.0 million, respectively, for excess and obsolete inventory. If actual demand for our products were to be substantially lower than estimated, additional inventory adjustments for excess or obsolete inventory might be required, which could have a material impact on our business, financial condition and results of operations.

Impairment of Investments

We classify our investments in debt and equity securities as available-for-sale securities in accordance with ASC topic 320, Investments—Debt and Equity Securities (“ASC 320”). All available-for-sale securities with a quoted market value below cost (or adjusted cost) are reviewed in order to determine whether the decline is other-than-temporary. Factors considered in determining whether a loss is temporary include the magnitude of the decline in market value, the length of time the market value has been below cost (or adjusted cost), credit quality, and our ability and intent to hold the securities for a period of time sufficient to allow for any anticipated recovery in market value.

We invest in equity instruments of privately-held companies in China for business and strategic purposes. These investments are classified as other assets and are accounted for under the cost method as we do not have the ability to exercise significant influence over their operations. We monitor our investments for impairment and record reductions in carrying value when events or changes in circumstances indicate that the carrying value may not be recoverable. Determination of impairment is highly subjective and is based on a number of factors, including an assessment of the strength of investee’s management, the length of time and extent to which the fair value has been less than our cost basis, the financial condition and near-term prospects of the investee, fundamental changes to the business prospects of the investee, share prices of subsequent offerings, and our intent and ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in our carrying value. We had no write-downs in 2014, 2013 and 2012.

Fair Value of Investments

ASC topic 820, Fair Value Measurement (“ASC 820”) establishes three levels of inputs that may be used to measure fair value.

Level 1 instruments represent quoted prices in active markets. Therefore, determining fair value for Level 1 instruments does not require significant management judgment, and the estimation is not difficult.

Level 2 instruments include observable inputs other than Level 1 prices, such as quoted prices for comparable instruments in markets with insufficient volume or infrequent transactions (less active markets), issuer credit ratings, non-binding market consensus prices that can be corroborated with observable market data, model-derived valuations in which all significant inputs are observable or can be derived principally from or corroborated with observable market data for substantially the full term of the assets or liabilities, or quoted prices for similar assets or liabilities. These Level 2 instruments require more management judgment and subjectivity compared to Level 1 instruments, including:

Level 3 instruments include unobservable inputs to the valuation methodology that are significant to the measurement of fair value of assets or liabilities. The determination of fair value for Level 3 instruments requires the most management judgment and subjectivity. As of December 31, 2014 and 2013, we did not have any assets or liabilities required to be carried at fair value without observable market values that would require a high level of judgment to determine fair value (Level 3 assets).

Impairment of Long-Lived Assets

We evaluate the recoverability of property, equipment and intangible assets in accordance with ASC topic 360, Property, Plant and Equipment (“ASC 360”). When events and circumstances indicate that long-lived assets may be impaired, we compare the carrying value of the long-lived assets to the projection of future undiscounted cash flows attributable to such assets. In the event that the carrying value exceeds the future undiscounted cash flows, we record an impairment charge against income equal to the excess of the carrying value over the asset’s fair value. Fair values are determined based on quoted market values, discounted cash flows or internal and external appraisals, as applicable. Assets held for sale are carried at the lower of carrying value or estimated net realizable value. We had no “Assets held for sale” on the consolidated balance sheet as of December 31, 2014 and 2013.

Stock Based Compensation

We account for stock-based compensation in accordance with ASC topic 718, Stock-based Compensation (“ASC 718”). Share-based awards granted include stock options and restricted stock awards. We utilize the Black-Scholes option pricing model to estimate the grant date fair value of stock options, which requires the input of highly subjective assumptions, including estimating stock price volatility and expected term. Historical volatility of our stock price was used while the expected term for our options was estimated based on historical option exercise behavior and post-vesting forfeitures of options, and the contractual term, the vesting period and the expected term of the outstanding options. Further, we apply an expected forfeiture rate in determining the amount of share-based compensation. We use historical forfeitures to estimate the rate of future forfeitures. Changes in these inputs and assumptions can materially affect the measure of estimated fair value of our stock compensation. The cost of restricted stock awards is determined using the fair value of our common stock on the date of grant.

We recognize the compensation costs net of an estimated forfeiture rate over the requisite service period of the options award, which is generally the vesting term of four years. Compensation expense for restricted stock awards is recognized over the vesting period, which is generally three years or four years. Stock-based compensation expense is recorded in cost of revenue, research and development, and selling, general and administrative expenses. (see Note 1—Summary of Significant Accounting Policies—Stock-Based Compensation).

Income Taxes

We account for income taxes in accordance with ASC topic 740, Income Taxes (“ASC 740”) which requires that deferred tax assets and liabilities be recognized using enacted tax rates for the effect of temporary differences between the book and tax bases of recorded assets and liabilities. ASC 740 also requires that deferred tax assets be reduced by a valuation allowance if it is more likely than not that a portion of the deferred tax asset will not be realized.

We provide for income taxes based upon the geographic composition of worldwide earnings and tax regulations governing each region, particularly China. The calculation of tax liabilities involves significant judgment in estimating the impact of uncertainties in the application of complex tax laws, particularly in foreign countries such as China.

See Note 13—”Income Taxes” in the consolidated financial statements for additional information.

Results of Operations

Overview

We were founded in 1986 to commercialize and enhance our proprietary vertical gradient freeze (VGF) technology for producing high-performance compound semiconductor substrates or wafers. We have one operating segment: our substrate business and the sale raw materials used to make such substrates or other related products. We recorded our first substrate sales in 1990 and our substrate division currently sells gallium arsenide (GaAs), indium phosphide (InP) and germanium (Ge) substrates to manufacturers of semiconductor devices for use in applications such as fiber optic and wireless telecommunications, light emitting diodes (LEDs), lasers and for solar cells for space and terrestrial photovoltaic applications. We also sell raw materials including gallium and germanium through our participation in majority- and minority-owned subsidiaries and joint ventures.

Operating Results

We manufacture all of our semiconductor substrates using our proprietary vertical gradient freeze (VGF) technology. Our GaAs substrate product line generates the most revenue as compared to Ge, InP or raw material sales. We manufacture all of our products in the People’s Republic of China (PRC or China), which generally has favorable costs for facilities and labor compared to comparable facilities in the United States, Japan or Europe. Our supply chain includes AXT subsidiaries and joint ventures in China, which provide us pricing advantages, reliable supply and enhanced sourcing lead-times for key raw materials which are central to our final manufactured products.

We have experienced declining annual revenue in the last three years, primarily as a result of silicon chips replacing GaAs chips in the mobile phone switching function. Previous to certain recent innovations silicon chips did not perform adequately in this function due to power consumption, heat and speed issues. The application of the silicon-on-insulator technique overcame these deficiencies and provided a lower cost solution for mobile phone switches. We believe that this transition in the mobile phone switches starting in 2011 was largely completed in late 2013 and early 2014. Mobile phones continue to use GaAs chips in other functions, primarily in the power amplifier function, and we are currently developing a GaAs substrate to meet the specifications for this function. The decline in revenue in 2014 compared to 2013 was partially mitigated by revenue growth in our InP and raw material product lines. As a result of the disruption in the GaAs substrate market caused by silicon-on-insulator, a leading Japanese competitor exited the market in 2014 and we believe this also contributed to the smaller decline in our revenue because customers turned to AXT and other suppliers to fulfill their GaAs substrate needs. We believe our product and customer diversity partially mitigated the declines in GaAs revenue.

In the first quarter of 2014 we reduced our work force by approximately 11% and embarked on a number of additional cost reduction programs, primarily in our manufacturing group which has the highest costs as compared to research and development or selling and administrative expenses. These steps helped to reduce our net loss from $8.0 million in 2013 to a net loss of $1.4 million in 2014. They also contributed to improved gross margins which moved from 13.9 percent in 2013 to 20.6 percent in 2014.

As we look ahead to 2015, we believe that certain applications and products can become strong revenue drivers but a number of these are still in the early stage of development or limited production downstream and we are unable to predict if and when these applications may become stronger drivers of revenue. We also intend to invest in manufacturing equipment that will increase automation and therein decrease the number of manually operated processing steps in our production flow. We believe this can improve our manufacturing yields, product quality and product consistency.

Revenue

Revenue decreased $1.8 million, or 2.2%, to $83.5 million in 2014 from $85.3 million in 2013. The revenue decrease resulted from decreased demand for our substrate materials, particularly for our Ge substrates which in 2013 were stronger than 2014 because of a Concentrated Photovoltaic (CPV) solar installation in South Africa. The decline in sales of Ge substrates was partially offset by an increase in 2014 in sales of InP substrates and in sales of raw materials. GaAs revenue decreased in 2014 by a modest amount, in the low single digits. GaAs revenue in the past several years has seen larger decreases as a result of silicon-based chips, or SOI, capturing a large portion of the switching function in mobile phones. For example, the year on year decline from 2012 to 2013 was 22% for GaAs. In light of the relatively modest decline in 2014 compared to previous years, we believe the disruptions caused by the introduction of SOI in mobile phone switches business have largely concluded. However there can be no assurances that other applications currently using our substrates will not be challenged by less expensive silicon-based wafers or other alternative technologies.

Revenue decreased by $3.0 million or 3.4%, to $85.3 million in 2013 from $88.4 million in 2012. The decrease in revenue was primarily due to the softer demand from our current customer base in the LED market and reduced orders from a few big customers as demand fell in the wireless market compared to 2012.

Revenue by Geographic Region

Sales to customers located outside of North America represented approximately 88%, 88% and 83% of our revenue during 2014, 2013 and 2012, respectively.

We increased our sales in Japan, Taiwan and Asia Pacific in 2014 by $2.5 million, $1.3 million and $2.0 million respectively. Increases in Japan resulted from a strategic focus of our selling and business development efforts initiated late in 2013. This strategic focus delivered modest benefits the first half of 2014 and more substantial benefits in second half of 2014. Increases in Taiwan and Asia Pacific resulted from generally a more active market for our products with existing customers and the addition of a sales professional assigned to these regions. Further,

we assigned additional resources for technical support to assist our customers in characterizing the products we delivered. In 2014 revenue from customers in China decreased substantially primarily due to decreased substrate revenue and raw material revenue. In 2014 revenue in North America and Europe was generally unchanged over 2013.

In 2013 revenue from customers located in North America decreased from 2012 by $4.7 million, or 30.7%. This decrease in 2013 was primarily due to decreased demand for raw materials primarily from 4N raw gallium and decreased demand for GaAs substrates, reflecting the changes in the mobile phone market. The decrease in North America in 2013 was partially offset by increased demand for InP substrates used in the optical networking industry. In 2013 revenue from customers in the Asia Pacific region (excluding China, Japan and Taiwan) decreased by $5.5 million, or 37.5%. This decrease was primarily due to decreased sales of GaAs substrates to customers in Singapore, partially offset by increased sales of Ge substrates to customers in Malaysia. In 2013 revenue from customers in China increased by $5.1 million, or 25.9%. China revenue in 2013 increased across all of our product lines. In 2013 revenue from customers located in Europe increased by $3.2 million, or 17.7%. The increase in Europe was primarily due to increased sales of Ge substrates and raw material sales to customers in Germany, partially offset by decreased demand for GaAs substrates from customers in Germany. In 2013 revenue in Japan and Taiwan was generally unchanged over 2012.

Gross Margin

Gross margin increased to 20.6% of total revenue in 2014 from 13.9% of total revenue in 2013. Gross margin increased primarily due to product mix and implementation of cost-saving activities during 2014. The 2014 quarter gross margin for the first quarter to the fourth quarter were 14.1%, 19.4%, 23.0% and 25.4%, respectively.

Gross margin decreased to 13.9% of total revenue in 2013 from 28.1% of total revenue in 2012. Lower revenue and lower average selling prices due to product mix and customer mix negatively impacted the gross margins for substrates for 2013. The 2013 quarter gross margin for the first quarter to the fourth quarter of 15.6%, 13.5%, 11.9% and 15.1%, respectively, respectively.

Selling, General and Administrative Expenses

Selling, general and administrative expenses decreased $1.1 million to $15.0 million for 2014 compared to $16.1 million for 2013. This decrease in 2014 primarily resulted from the implementation of cost-saving activities and a decrease in bad debt expense. These items were partially offset by an increase in professional services of $613,000 related to an investigation of certain potential related-party transactions, and higher personnel related costs. We expect our selling, general administrative expenses to increase in the first quarter of 2015 due to higher professional services expense incurred of approximately $1.2 million related to the investigation.

Selling, general and administrative expenses increased $647,000 to $16.1 million for 2013 compared to $15.4 million for 2012. This increase in 2013 was primarily due to an increase in bad debt expense and higher rent expense primarily from early termination penalty of our lease for our U.S. office, partially offset by decreased sales commission expenses resulting from lower revenue and lower office supply expenses.

Research and Development Expenses

Research and development expenses increased $720,000, or 21.0%, to $4.1 million for 2014 from $3.4 million for 2013. Research and development expenses increased primarily due to higher product development and testing costs and personnel related costs, partially offset by lower consulting expenses for product testing. We expect our rate of expenditures on research and development costs in 2015 to be stable as we, and our consolidated subsidiaries and joint ventures maintain our research and development efforts.

Research and development expenses decreased $44,000, or 1.3%, to $3.4 million for 2013 from $3.5 million for 2012. Research and development expenses decreased slightly primarily due to lower personnel related costs including the fact that no bonuses were paid due to lack of achievement of financial metrics and lower product development and testing costs, partially offset by higher consulting expenses for product testing.

Restructuring Charges

In the first quarter of 2014, we reduced the workforce at Tongmei by approximately 93 positions that are no longer required to support production and operations, or approximately 11 percent of the workforce. We recorded a restructuring charge of approximately $907,000 related to the reduction in force for severance-related expenses. This restructuring plan and reduction in force has been completed as of March 31, 2014.

Interest Income, Net

Interest income, net increased $75,000 to $483,000 for 2014 from $408,000 for 2013 primarily due to higher interest income earned by one of our subsidiaries from their bank deposits.

Interest income, net decreased $110,000 to $408,000 for 2013 from $518,000 for 2012 primarily due to lower returns from various investment portfolio mix, lower investment balances and lower interest income earned by our consolidated joint ventures from their bank.

Equity in Earnings of Unconsolidated Joint Ventures

Equity in earnings of unconsolidated joint ventures is primarily net income from our minority-owned joint ventures that are not consolidated. Equity in earnings of unconsolidated joint ventures increased $151,000 to $1.5 million for 2014 from $1.4 million for 2013 primarily due to higher net income from improved performance of our minority-owned joint ventures that are not consolidated.

Equity in earnings of unconsolidated joint ventures increased $96,000 to $1.4 million for 2013 from $1.3 million for 2012 primarily due to higher net income recorded by our consolidated joint ventures from their minority investments.

Other Income (Expense), Net

NM = % not meaningful

Other income, net increased $1.1 million to a profit net income of $361,000 for 2014 from net expense of $748,000 for 2013 primarily due to a larger gain recognized from the sale of Intelligent Epitaxy Technology, Inc (IntelliEpi) common stock in 2014, lower withholding tax on foreign dividends from our consolidated joint ventures and lower foreign exchange losses in 2014.

Other expense, net decreased $13,000 to $748,000 for 2013 from $761,000 for 2012 primarily due to the gain recognized from the sale of our 35% ownership in our cost method investee (IntelliEpi) in its pre-IPO placement in Taiwan, In addition, in 2013 we did not have a loss on disposal of equipment as we did in 2012, this was partially offset by higher foreign exchange losses in 2013.

Provision for (benefit from) Income Taxes

Provision for income taxes for 2014 was $215,000, which was mostly related to our China subsidiary and our China joint venture operations. The slight increase in provision for income taxes from 2013 to 2014 was primarily due to higher taxable income for state tax purposes in the U.S. Besides the state tax liabilities, no income taxes or benefit have been provided for U.S. operations due to the loss in the U.S. and the uncertainty of generating future profit in the U.S. which has resulted in our deferred tax asset being fully reserved. Our estimated tax rate can vary greatly from year to year because of the change or benefit in the mix of taxable income between our U.S. and China based operations.

Provision for income taxes for 2013 was $188,000, which was mostly related to our China subsidiary and our China joint venture operations. The decrease in provision for income taxes from 2012 to 2013 was due to decreased net income of our foreign subsidiaries as well as lower taxable income for state tax purposes in the U.S. Furthermore, the provision for income taxes was partially offset by tax refunds received by our China joint ventures. Besides the state tax liabilities, no income taxes or benefit have been provided for U.S. operations due to the loss in the U.S. and the uncertainty of generating future profit in the U.S. which has resulted in our deferred tax asset being fully reserved. Our estimated tax rate can vary greatly from year to year because of the change or benefit in the mix of taxable income between our U.S. and China based operations.

Due to our uncertainty regarding our future profitability, we recorded a full valuation allowance against our net deferred tax assets of $62 million in 2014, $58 million in 2013 and $51 million in 2012.

Noncontrolling Interest

Noncontrolling interest in earnings of consolidated joint ventures for the years ended December 31, 2014, 2013 and 2012 were $691,000, $1.1 million and $3.0 million, respectively. The decrease in noncontrolling interest from 2014 to 2013 and 2012 to 2013 was due to lower profitability from our China joint venture operations as profits from raw materials sales have decreased due to decreased selling prices.

Liquidity and Capital Resources

We consider cash and cash equivalents, short-term investments and long-term investments as liquid and available for use within two years in our current operations. Short-term investments and long-term investments are comprised of U.S. government securities and investment-grade corporate notes and bonds. Also included in short-term investments is our investment in common stock of IntelliEPI, a Taiwan publicly-traded company. In 2013, we re-categorized our IntelliEPI investment from cost method investment to available-for–sale security as they completed their initial public offering in 2013.

As of December 31, 2014, our principal sources of liquidity were $48.9 million, an increase of $1.3 million from $47.6 million as of December 31, 2013. This $48.9 million consisted of cash and cash equivalents of $28.8 million, short-term investments of $12.3 million and long-term investments of $7.8 million. In 2014 cash and cash equivalents increased $3.8 million. Short and long-term investments decreased by $2.5 million to $20.1 million from $22.6 million. The increase in cash and cash equivalents was primarily due to net cash provided by operating activities of $3.8 million and by net cash provided by investing activities of $142,000, offset by net cash used in financing activities of $32,000 and the effect of exchange rate changes of $81,000. As of December 31, 2014, we and our consolidated joint ventures held approximately $18.3 million in cash and investments in foreign bank accounts. This consists of $10.2 million held by our wholly owned subsidiary in China and $8.1 million held by our three partially owned consolidated subsidiaries in China. Of this $18.3 million, approximately $13.9 million is not available for use in the United States without paying United States income taxes.

As of December 31, 2013, our principal sources of liquidity were $47.6 million of cash and investments, a decrease of $2.5 million from $50.1 million as of December 31, 2012. This $47.6 million consisted of cash and cash equivalents of $25.0 million, short-term investments of $12.5 million and long-term investments of $10.1 million. In 2013 cash and cash equivalents decreased $5.7 million. Short-term and long-term investments increased by $3.2 million to $22.6 million from $19.5 million. The $5.7 million combined decrease in cash and cash equivalents was primarily due to net cash provided by operating activities of $2.5 million, offset by net cash used in investing activities of $6.2 million and net cash used in financing activities of $2.5 million. As of December 31, 2013, we and

our consolidated joint ventures held approximately $18.7 million in cash and investments in foreign bank accounts which is not available for use in the United States without paying United States income taxes.

Net cash provided by operating activities of $3.8 million for 2014 was primarily comprised of our net loss of $697,000, adjusted for non-cash items of depreciation and amortization of $5.6 million, stock-based compensation of $1.1 million, provision for doubtful accounts of $9,000, amortization of marketable securities premium of $432,000, offset by gain on sales of investment of $1.3 million, a gain on disposal of property, plant and equipment of $13,000 and a net change of $1.4 million in assets and liabilities. The $1.4 million net change in assets and liabilities primarily resulted from a $479,000 decrease in inventories, a $2.4 million decrease in prepaid expenses and other current assets, offset by a $3.0 million increase in accounts receivable, a $255,000 increase in other assets, a $979,000 decrease in accounts payable, a $742,000 increase in accrued liabilities and a $833,000 decrease in other long-term liabilities.

Net cash provided by operating activities of $2.5 million for 2013 was primarily comprised of our net loss of $6.8 million, adjusted for non-cash items of depreciation and amortization of $5.5 million, stock-based compensation of $1.3 million, provision for doubtful accounts of $869,000, amortization of marketable securities premium of $518,000, offset by gain on sale of cost method investment of $811,000, a gain on disposal of property, plant and equipment of $9,000 and a net change of $2.0 million in assets and liabilities. The $2.0 million net change in assets and liabilities primarily resulted from a $1.4 million decrease in inventories, a $645,000 increase in prepaid expenses and other current assets, a $2.2 million decrease in accounts receivable, a $1.9 million increase in other assets, a $2.2 million increase in accounts payable, a $899,000 decrease in accrued liabilities and a $373,000 decrease in other long-term liabilities.

Net cash provided by operating activities of $21.3 million for 2012 was primarily comprised of our net income of $6.2 million, adjusted for non-cash items of depreciation and amortization of $3.9 million, stock-based compensation of $1.2 million, amortization of marketable securities premium of $323,000, a loss on disposal of property, plant and equipment of $195,000 and a net change of $9.5 million in assets and liabilities. The $9.5 million net change in assets and liabilities primarily resulted from a $5.7 million decrease in inventories, a $1.8 million decrease in prepaid expenses and other current assets, a $54,000 decrease in accounts receivable, a $174,000 increase in other assets, a $2.6 million increase in accounts payable, a $461,000 increase in accrued liabilities and a $900,000 decrease in other long-term liabilities.

Net cash provided by investing activities of $142,000 for 2014 was primarily from the sale of investments totaling $13.9 million offset by the purchase of investments totaling $11.8 million and the purchase of property, plant and equipment of $2.0 million.

Net cash used in investing activities of $6.2 million for 2013 was primarily from the purchase of property, plant and equipment of $5.4 million mainly for our China facilities and the purchase of investments totaling $14.1 million offset by the sale of investments totaling $12.5 million.

Net cash used in investing activities of $13.2 million for 2012 was primarily from the purchase of property, plant and equipment of $7.1 million mainly in our China facilities, loan from our consolidated joint venture to its equity investment entity of $875,000 and the purchase of investments totaling $12.1 million offset by the sale of investments totaling $6.9 million.

In January 2012, we increased the credit facility line of credit, secured by the marketable securities, with a bank from $3.0 million to $10.0 million at an annual interest rate of 1.65% above the current 30-day LIBOR (London Interbank Offered Rate). As of December 31, 2014 and 2013, we had not used the line of credit.

Net cash used in financing activities was $32,000 for 2014, which consisted of $166,000 net dividends paid by our consolidated joint ventures, partially offset by net proceeds of $134,000 on the issuance of common stock pursuant to stock option exercises.

Net cash used in financing activities was $2.5 million for 2013, which consisted of $2.3 million net dividends paid by our consolidated joint ventures and $716,000 of repurchases of shares of our common stock, partially offset by net proceeds of $532,000 on the issuance of common stock pursuant to stock option exercises.

Net cash used in financing activities was $3.8 million for 2012, which consisted of $4.1 million net dividends paid by our consolidated joint ventures, partially offset by net proceeds of $294,000 on the issuance of common stock pursuant to stock option exercises.

On February 21, 2013, our Board of Directors approved a stock repurchase program pursuant to which we may repurchase up to $6.0 million of our outstanding common stock through February 27, 2014. These purchases can be made from time to time in the open market and are funded from our existing cash balances and cash generated from operations. During 2013, we repurchased approximately 285,000 shares at an average price of $2.51 per share for a total purchase price of $716,000 under the stock repurchase program. As of December 31, 2013, approximately $5.3 million remained available for future repurchases under this program. No shares were repurchased in 2014 under this program and the plan expired on February 27, 2014.

On October 27, 2014, our Board of Directors approved a stock repurchase program pursuant to which we may repurchase up to $5.0 million of our outstanding common stock. These purchases can be made from time to time in the open market and are funded from our existing cash balances and cash generated from operations. See Item 5, Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities in Part II.

We believe that we have adequate cash and investments to meet our needs over the next 12 months. If our sales decrease, however, our ability to generate cash from operations will be adversely affected which could adversely affect our future liquidity, require us to use cash at a more rapid rate than expected, and require us to seek additional capital. There can be no assurance that such additional capital will be available or, if available it will be on terms acceptable to us.

Cash from operations could be affected by various risks and uncertainties, including, but not limited to those set forth below under Item 1A. “Risk Factors” above.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet financing arrangements and have never established any special purpose entities. We have not entered into any options on non-financial assets.

Contractual Obligations

We lease certain office space, manufacturing facilities and equipment under long-term operating leases expiring at various dates through December 2025. The lease agreement for the facility at Fremont, California with approximately 27,760 square feet commenced on December 1, 2008 for a term of seven years, with an option by us to cancel the lease after five years, upon forfeiture of the security deposit and payment of one-half of the fifth year’s rent. On June 28, 2013, we sent a notice to terminate the lease effective November 30, 2013 with an early termination penalty of $142,000 which was recorded as an expense in the third quarter of 2013. On August 2, 2013, we signed a new lease agreement for the current facility with reduced footage of 20,767 square feet, which commenced on December 1, 2013 for a term of two years. The reduced square footage, the reduced rate per square foot, and the expected reduced operating costs, would save us approximately $382,000 during 2014 and 2015. In September 2014, we signed an amendment to the current lease to further reduce square footage to 19,467 square feet and to extend the term of the lease two more years. Total rent expenses under these operating leases were approximately $260,000, $638,000 and $447,000 for the years ended December 31, 2014, 2013 and 2012, respectively.

We entered into a royalty agreement with a competitor effective December 3, 2010 with a term of eight years, terminating December 31, 2018. We and our related companies are granted a worldwide, nonexclusive, royalty bearing, irrevocable license to certain patents for the term on the agreement. We shall pay a total of $7.0 million royalty payment over eight years that began in 2011 based on future royalty bearing sales. This agreement contains a clause that allows us to claim for credit, starting in 2013, in the event that the royalty bearing sales for the year is lower than a pre-determined amount set forth in this agreement. Royalty expense under this agreement was $577,000 which was net of claim for credit of $223,000 and $530,000 which was net of claim for credit of $270,000 for the years ended December 31, 2014 and 2013, respectively. Royalty expense was $1.4 million for the years ended December 31, 2012. These expenses were included in cost of revenue.

The following table summarizes our contractual obligations as of December 31, 2014 (in thousands):

Selected Quarterly Results of Operations

The following table sets forth unaudited quarterly results for the eight quarters ended December 31, 2014. The information for each of these quarters is unaudited but has been prepared on the same basis as the audited consolidated financial statements. We believe that all necessary adjustments, consisting only of normal recurring adjustments, have been included in the amounts stated below to present fairly such quarterly information. The operating results for any quarter are not necessarily indicative of results for any subsequent period.