Table of Contents

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 11-K

(Mark One)

x           ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2012

OR

o    TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                   to                  

Commission file number 1-2360

A.            Full title of the plan and address of the plan, if different from that of the issuer named below:

IBM 401(k) Plus Plan

Director of Compensation and Benefits

IBM

North Castle Drive, M/D 147

Armonk, New York 10504

B.            Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

INTERNATIONAL BUSINESS MACHINES CORPORATION

New Orchard Road

Armonk, New York 10504

Table of Contents

IBM 401(k) PLUS PLAN

Table of Contents

Exhibit:

Exhibit 23 - Consent of Independent Registered Public Accounting Firm

*   Other schedules required by Section 2520.103-10 of the Department of Labor Rules and Regulations for Reporting and Disclosures under the Employee Retirement Income Security Act of 1974 are omitted because they are not applicable.

2

Table of Contents

SIGNATURE

The Plan.  Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned thereunto duly authorized.

3

Table of Contents

Report of Independent Registered Public Accounting Firm

To the Members of the International Business Machines Corporation (“IBM”) Retirement Plans Committee and the Participants of the IBM 401(k) Plus Plan:

In our opinion, the accompanying statements of net assets available for benefits and the related statement of changes in net assets available for benefits present fairly, in all material respects, the net assets available for benefits of the IBM 401(k) Plus Plan (the “Plan”) at December 31, 2012 and 2011, and the changes in net assets available for benefits for the year ended December 31, 2012 in conformity with accounting principles generally accepted in the United States of America.  These financial statements are the responsibility of the Plan’s management.  Our responsibility is to express an opinion on these financial statements based on our audits.  We conducted our audits of these statements in accordance with the standards of the Public Company Accounting Oversight Board (United States).  Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement.  An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation.  We believe that our audits provide a reasonable basis for our opinion.

Our audits were conducted for the purpose of forming an opinion on the basic financial statements taken as a whole.  The supplemental schedules of loans or fixed income obligations in default or classified as uncollectible, of assets (held at end of year) and of assets (acquired and disposed of within year) are presented for the purpose of additional analysis and are not a required part of the basic financial statements but are supplementary information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974.  These supplemental schedules are the responsibility of the Plan’s management.  The supplemental schedules have been subjected to the auditing procedures applied in the audits of the basic financial statements and, in our opinion, are fairly stated in all material respects in relation to the basic financial statements taken as a whole.

4

Table of Contents

IBM 401(k) PLUS PLAN

STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS

AT DECEMBER 31,

The accompanying notes are an integral part of these financial statements.

5

Table of Contents

IBM 401(k) PLUS PLAN

STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS

FOR THE YEAR ENDED DECEMBER 31,

The accompanying notes are an integral part of these financial statements.

6

Table of Contents

IBM 401(k) PLUS PLAN

NOTES TO FINANCIAL STATEMENTS

NOTE 1 - DESCRIPTION OF THE PLAN

The following description of the IBM 401(k) Plus Plan (the “Plan”) provides only general information.  Participants should refer to the Plan prospectus (Summary Plan Description) for a complete description of the Plan’s provisions.

General

The Plan was established by resolution of International Business Machines Corporation’s Retirement Plans Committee (the “Committee”) effective July 1, 1983 and Plan assets are held in trust for the benefit of its participants.  The Plan offers all eligible active, full-time and part-time regular and long-term supplemental United States (U.S.) employees of International Business Machines Corporation (“IBM”) and certain of its domestic related companies and partnerships an opportunity to defer from one to eighty percent of their eligible compensation for before-tax 401(k) and/or Roth 401(k) contributions to any of thirty-three primary investment funds and about 165 mutual funds in a “mutual fund window.”  The investment objectives of the primary funds are described in Note 6, Description of Investment Funds.  In addition, participants are able to contribute up to ten percent of their eligible compensation on an after-tax basis.  Roth 401(k) and after-tax contributions are not available for employees working in Puerto Rico.  Annual contributions are subject to the legal limits permitted by Internal Revenue Service (“IRS”) regulations.

Participants are provided the choice to enroll in a “disability protection program” under which a portion of the participant’s account is used to pay premiums to purchase term insurance (underwritten by Metropolitan Life Insurance Company), which will pay the amount of their before-tax 401(k) contributions, matching contributions, automatic contributions and/or Special Savings Awards into their accounts in the event the participant becomes disabled while insured.

At December 31, 2012 and 2011, the number of participants with an account balance in the Plan was 197,713 and 200,205, respectively.

The Plan is dual qualified under Section 401(a) of the Internal Revenue Code of 1986, as amended, and Section 1081.01 of the Internal Revenue Code for a New Puerto Rico (2011).  It is subject to the provisions of the Employee Retirement Income Security Act of 1974 (“ERISA”), as amended.

Administration

The Plan is administered by the Committee, which appointed certain officials of IBM to assist in administering the Plan.  The Committee appointed State Street Bank and Trust Company (“SSBT”), as Trustee, to safeguard the assets of the funds and State Street Global Advisors (“SSGA”), the institutional investment management affiliate of SSBT, The Vanguard Group and other investment managers to direct investments in the various funds.

7

Table of Contents

Fidelity Investments Institutional Operations Company, Inc. (“Fidelity”) is the provider of record keeping and participant services, operator of the IBM Employee Services Center for the Plan in Raleigh, North Carolina as well as the provider of administrative services related to the mutual fund window.  Communications services were provided by Fidelity as well as The Vanguard Group.

Contributions

Under the Plan, IBM provides employer contributions for eligible participants as shown in the table below:

IBM employer contributions are based upon the IBM pension formula for which the employee was eligible on December 31, 2007, or on hire date on or after January 1, 2005.  Any employees who terminate employment and are rehired on or after January 1, 2005 will be eligible to participate in the “New Hires on or after 1/1/2005” contribution rates.

A contribution equal to five percent of eligible compensation (referred to as a “Special Savings Award”) will be added to the accounts of participants who are non-exempt employees at each year-end  (effective January 1, 2013, the determination will be made on  December 15 and the Special Savings Award will be contributed to eligible participants on the last business day of the year) and who participated in the Pension Credit Formula as of December 31, 2007 and have been continuously employed by IBM since that date.

Newly hired employees are automatically enrolled at 5 percent of eligible salary and performance pay after approximately thirty days of employment with IBM, unless they elect otherwise.  After completing one year of service with IBM, they are eligible for the IBM automatic contribution and the IBM matching contribution.  Contributions will be invested in the default Target Date fund that most closely corresponds to the year in which they will reach age 60 unless they elect otherwise.  The match maximizer is an automatic feature that ensures they will receive the full IBM match for their savings level (based on eligible 401(k) deferrals and eligible pay) no matter what their savings patterns are during the year. Any match maximizer amount for which they are eligible will be calculated and added to their account each pay period.

Effective January 1, 2013, matching and automatic contributions are made once annually at the end of the year.  In order to receive such contributions each year, a participant must be employed on December 15 of the plan year.  However, if a participant separates from service prior to December 15, and has completed certain service and/or age requirements, then the participant will be eligible to receive such matching and automatic contributions following separation from service.

Eligible compensation under the Plan includes regular salary, commissions, overtime, shift premium and similar additional compensation payments for nonscheduled workdays, recurring payments under an employee variable compensation plan, regular IBM Short-Term Disability Income Plan payments, holiday pay and vacation pay, and payments made under any executive incentive compensation plan.  Non-recurring compensation, such as awards, deal team payments and significant signing bonuses are not eligible compensation and cannot be deferred under the Plan.

8

Table of Contents

Participants are able to choose to have their contributions invested entirely in one of, or in any combination of, the following funds or in the mutual fund window funds, in multiples of one percent.  These funds and their investment objectives are more fully described in Note 6, Description of Investment Funds.

Life Cycle Funds (14)

Target Date 2005 Fund

Target Date 2010 Fund

Target Date 2015 Fund

Target Date 2020 Fund

Target Date 2025 Fund

Target Date 2030 Fund

Target Date 2035 Fund

Target Date 2040 Fund

Target Date 2045 Fund

Target Date 2050 Fund

Income Plus Life Strategy Fund

Conservative Life Strategy Fund

Moderate Life Strategy Fund

Aggressive Life Strategy Fund

Core Funds (7)

Interest Income Fund (Prior to February 29, 2012, named Stable Value Fund)
Inflation Protected Bond Fund

Total Bond Market Fund

Total Stock Market Index Fund

Total International Stock Market Index Fund

Real Estate Investment Trust (REIT) Index Fund

International Real Estate Index Fund

Expanded Choice Funds (12)

Long-Term Corporate Bond Fund

High Yield and Emerging Markets Bond Fund

Large Company Index Fund

Large-Cap Value Index Fund

Large-Cap Growth Index Fund

Small/Mid-Cap Stock Index Fund

Small-Cap Value Index Fund

Small-Cap Growth Index Fund

European Stock Index Fund

Pacific Stock Index Fund

Emerging Markets Stock Index Fund

IBM Stock Fund

9

Table of Contents

The Plan participants also have access to the “mutual fund window” investment options.

Participants may change their deferral percentage and investment selection for future contributions at any time.  The changes will take effect for the next eligible pay cycle if the request is completed before the applicable cutoff date.  Also, participants may transfer part or all of existing account balances among funds in the Plan once daily, subject to the Plan restrictions on trading.

The Committee is committed to preserving the integrity of the Plan as a long-term savings vehicle for its employees.  Frequent, short-term trading that is intended to take advantage of pricing lags in funds can harm long-term investors, or increase trading expenses in general.  Therefore, the Plan has implemented frequent trading transaction restrictions and reserves the right to take other appropriate action to curb short-term transactions (buying/selling).

Participant Accounts

The Plan record keeper maintains an account in the name of each participant to which each participant’s contributions and share of the net earnings, losses and expenses, if any, of the various investment funds are recorded.  The earnings on the assets held in each of the funds and all proceeds from the sale of such assets are held and reinvested in the respective funds.

Participants may transfer rollover contributions of before-tax and Roth 401(k) amounts from other qualified savings plans or Individual Retirement Accounts into their Plan account.  Rollovers must be made in cash within the time limits specified by the IRS; stock or in-kind rollovers are not accepted.  These rollovers are limited to active employees on the payroll of IBM (or affiliated companies) who have existing accounts in the Plan.  Retirees are not eligible for such rollovers, except that a retiree or separated employee who has an existing account in the Plan may rollover a lump-sum distribution from an IBM-sponsored qualified retirement plan, including the IBM Personal Pension Plan.  After-tax amounts may also be directly rolled over into the Plan from another qualified savings plan.

On each valuation date, the unit/share value of each fund is determined by dividing the current investment value of the assets in that fund on that date by the number of units/shares in the fund.  The participant’s investment value of assets equals the market value of assets for all funds except the Interest Income Fund (effective February 29, 2012; previously Stable Value Fund) for which the participant’s investment value of assets equals the contract value of assets.  In determining the unit/share value, new contributions that are to be allocated as of the valuation date are excluded from the calculation.  On the next day, the cash related to new contributions is transferred into the fund and the number of additional units to be credited to a participant’s account for each fund, due to new contributions, is equal to the amount of the participant’s new contributions to the fund divided by the prior night’s unit value.

10

Table of Contents

Contributions (with the exception of after-tax contributions and Roth 401(k) contributions) made to the Plan, as well as interest, dividends, or other earnings of the Plan are generally not included in the taxable income of the participant until withdrawal, at which time all earnings and contributions withdrawn generally are taxed as ordinary income to the participant.  Additionally, withdrawals by the participant before attaining age 59 1/2 generally are subject to a penalty tax of 10 percent.  After-tax contributions made to the Plan are not tax deferred, but are taxable income prior to the participant making the contribution.  Any interest, dividends or other earnings on the after-tax contributions are generally not included in the taxable income of the participant until withdrawal, at which time all earnings withdrawn are generally taxed as ordinary income to the participant.  Any distribution of earnings on after-tax contributions that are withdrawn by the participant before attaining age 59 1/2 generally are subject to a penalty tax of 10 percent.  Roth 401(k) contributions are not deferred, but are taxable income prior to the participant making the contribution.  Interest, dividends or other earnings on Roth 401(k) contributions may not be taxable at withdrawal provided the participant has met the applicable rules.

Consistent with provisions established by the IRS, the Plan’s 2012 limit on employee salary and performance pay deferrals was $17,000.  (The limit for 2013 is $17,500.)  Participants who were age 50 or older during 2012 could take advantage of a higher 401(k) contribution limit of $22,500 ($23,000 for 2013).  The 2012 maximum annual deferral amount for employees residing in Puerto Rico was limited by local government regulations to $17,000.  (The Puerto Rico limit for 2013 is $17,500.)  Puerto Rico participants who were age 50 or older in 2012 could take advantage of a higher contribution limit of $18,500 ($19,000 for 2013).

Vesting

Participants in the Plan are at all times fully vested in their account balance, including employee contributions, employer contributions and earnings thereon, if any.

Distributions

Participants who have attained age 59 1/2 may request a distribution of all or part of the value in their account.  A maximum of four distributions are allowed each year and the minimum amount of any such distribution shall be the lesser of the participant’s account balance or $500.

In addition, participants who (1) retire under the prior IBM Retirement Plan provisions of the IBM Personal Pension Plan, or (2) become eligible for benefits under the IBM Long-Term Disability Plan or the IBM Medical Disability Income Plan, or (3) separate from IBM and have attained age 55, may also elect to receive the balance of their account in annual installments over a period not to exceed twenty years.

Withdrawals for financial hardship are permitted provided they are for an immediate and significant financial need, and the distribution is necessary to satisfy that need.  Employees are required to fully use the Plan loan program, described below, before requesting a hardship withdrawal.  Only an employee’s contributions are eligible for hardship withdrawal; earnings on before-tax 401(k) and Roth 401(k), and IBM contributions (match, automatic, transition credits and Special Savings Award) are not

11

Table of Contents

eligible for withdrawal.  Employees must submit evidence of hardship to the record keeper who will determine whether the situation qualifies for a hardship withdrawal based on guidance from the Plan administrator.   A hardship withdrawal is taxed as ordinary income to the employee and may be subject to the 10 percent additional tax on early distributions.

If the participant dies and is married at the time of death, the participant’s spouse must be the beneficiary of the participant’s Plan account, unless the participant’s spouse has previously given written, notarized consent to designate another person as beneficiary.  If the participant marries or remarries, any prior beneficiary designation is canceled and the spouse automatically becomes the beneficiary.  If the participant is single, the beneficiary may be anyone previously designated by the participant under the Plan.  In the absence of an effective designation under the Plan at the time of death, the proceeds normally will be paid in the following order:  the participant’s spouse, the participant’s children in equal shares, or to surviving parents equally.  If no spouse, child, or parent is living, payments will be made to the executors or administrators of the participant’s estate.

After the death of a participant, an account will be established for the participant’s beneficiary.  If the beneficiary is a spouse or domestic partner, the beneficiary’s account may be maintained in the Plan, subject to IRS Minimum Required Distribution rules.  If the beneficiary is neither a spouse nor a domestic partner, the account will be paid to the beneficiary in a lump sum.  Beneficiaries may rollover distributions from the Plan.

Participant Loans

Participants may borrow up to one-half of the value of their account balance, not to exceed $50,000, within a twelve month period.  Loans will be granted in $1 increments subject to a minimum loan amount of $500.  Participants are limited to two simultaneous outstanding Plan loans.  Repayment of a loan is made through semi-monthly payroll deductions.  Loans originated under the Plan have a repayment term of one to four years for a general purpose loan or one to ten years for a primary residence loan.  There are a limited number of outstanding loans originated under acquired company plans that were merged into the Plan having repayment terms greater than 10 years and up to a maximum term of 30 years.  The loans originated under the Plan bear a fixed rate of interest, set quarterly, for the term of the loan, determined by the plan administrator to be 1.25 points above the prime rate.  The interest is credited to the participant’s account as the semi-monthly repayments of principal and interest are made.  Interest rates on outstanding loans at December 31, 2012 and 2011 ranged from 3.25 percent to 11.00 percent.

Participants may prepay the entire remaining loan principal at any time.  Employees on an approved leave of absence may elect to make scheduled loan payments directly to the Plan.  Participants may continue to contribute to the Plan while having an outstanding loan.  A loan default is a taxable event to the participant and will be reported as such in the year of the loan default.

Participants who retire or separate from IBM and have outstanding Plan loans may make loan repayments via coupon payments or  ACH deductions to continue monthly loan repayments according to their original amortization schedule.

12

Table of Contents

Termination of Service

If the value of a participant’s account is $1,000 or less, it will be distributed to the participant in a lump-sum payment following the termination of the participant’s employment with IBM.  If the account balance is greater than $1,000 at the time of separation, the participant may defer distribution of the account until age 70 ½.

Termination of the Plan

IBM reserves the right to terminate this Plan at any time by action of the Board of Directors of IBM.  In that event, each participant or beneficiary receiving or entitled to receive payments under the Plan would receive the balance of the account at such time and in accordance with applicable law and regulations.  In the event of a full or partial termination of the Plan, or upon complete discontinuance of contributions under the Plan, the rights of all affected participants in the value of their accounts would be non-forfeitable.

Risks and Uncertainties

The Plan provides for various investment options in the form of mutual funds, commingled funds or separately-managed funds. These funds invest in equities, fixed income securities, synthetic guaranteed investment contracts (“synthetic GICs”) and derivative contracts.  Investment securities are exposed to various risks, such as interest rate movements, credit quality changes and overall market volatility.  Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, it is reasonably possible that changes in risks in the near term could materially affect participants’ account balances and the amounts reported in the statement of net assets available for benefits.  The Plan is potentially exposed to credit loss in the event of non-performance by the companies with whom the synthetic GICs are placed.  However, the Committee does not anticipate non-performance by these companies at this time.

NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying financial statements are prepared under the accrual basis of accounting, except distributions, which are recorded when paid.  Notes receivable from participants are measured at their unpaid principal balance plus any accrued interest.  Within the financial tables presented, certain columns and rows may not add due to the use of rounded numbers for disclosure purposes.

13

Table of Contents

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and changes therein, and disclosures of contingent assets and liabilities at the date of the financial statements.  Actual results could differ from those estimates.

Investment Contracts

Investment contracts held by a defined contribution plan are reported at fair value. However, contract value is the relevant measurement attribute for that portion of the net assets available for benefits of a defined contribution plan attributable to fully benefit responsive investment contracts because contract value is the amount participants would receive if they were to initiate permitted transactions under the terms of the Plan.  Contract value represents contributions made to investment contracts plus interest at the contract rates less withdrawals and administrative expenses.  The statements of net assets available for benefits present the fair value of the investment in the Interest Income Fund as well as the adjustment from fair value to contract value for the fully benefit responsive investment contracts within the Interest Income Fund as of December 31, 2012 (Stable Value Fund as of December 31, 2011).  The statement of changes in net assets available for benefits presents these investments on a contract value basis.

Valuation of Investments

The Plan’s investments are stated at fair value, which is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.  Under fair value measurement guidance, the Plan is required to classify certain assets and liabilities based on the fair value hierarchy.  The framework establishes a three-level fair value hierarchy based on the nature of the information used to measure fair value.  These levels are accounting terms that refer to different methods of valuing assets and do not represent relative risk or credit quality of an investment.  The levels of assets are as follows:

· Level 1 — Quoted prices in active markets that are unadjusted and accessible at the measurement date for identical, unrestricted assets or liabilities;

· Level 2 — Quoted prices for identical assets and liabilities in markets that are not active, quoted prices for similar assets and liabilities in active markets or financial instruments for which significant inputs are observable, either directly or indirectly; and

· Level 3 — Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable, including the Plan’s own assumptions in determining fair value.

14

Table of Contents

Assets are classified within the fair value hierarchy according to the lowest level input that is significant to the fair value measurement. Valuation techniques used maximize the use of observable inputs and minimize the use of unobservable inputs.  A security that is categorized as level 3 is valued using the last available market price or a price from an alternate pricing source.  The valuation methodology is applied consistently from period to period.

Investments in mutual funds and commingled funds are valued at the net asset values per share using available inputs to measure fair value by such companies or funds as of the valuation date. Generally, mutual funds have a quoted market price in an active market and are classified as Level 1 and commingled funds are classified as Level 2 based upon observable data.

Common stocks and financial derivative instruments, such as futures contracts or options contracts that are traded on a national securities exchange are stated at the last reported sale or settlement price on the day of valuation.  Valuation adjustments may be applied to certain securities that are solely traded on a foreign exchange to account for the market movement between the close of the foreign market and the close of the New York Stock Exchange. These securities are valued using pricing service providers that consider the correlation of the trading patterns of the foreign security to the intraday trading in the U.S. markets for investments.

Fixed income investments are valued on the basis of valuations furnished by Trustee-approved independent pricing services. These services determine valuations for normal institutional-size trading units of such securities using models or matrix pricing, which incorporates yield and/or price with respect to bonds that are considered comparable in characteristics such as rating, interest rate and maturity date and quotations from bond dealers to determine current value. If these valuations are deemed to be either not reliable or not readily available, the fair value will be determined in good faith by the Trustee.

Over-the-counter derivatives are typically valued using proprietary pricing models that use as their basis readily observable market parameters — that is, parameters that are actively quoted and can be validated to external sources, including industry pricing services. Depending on the types and contractual terms of derivatives, fair value can be modeled using a series of techniques, such as the Black-Scholes option pricing model, simulation models or a combination of various models, which are consistently applied. Where derivative products have been established for some time, the Plan uses models that are widely accepted in the financial services industry. These models reflect the contractual terms of the derivatives, including the period to maturity, and market-based parameters such as interest rates, volatility, and the credit quality of the counterparty. Further, many of these models do not contain a high level of subjectivity, as the methodologies used in the models do not require significant judgment, and inputs to the model are readily observable from actively quoted markets, as is the case for “plain vanilla” interest rate swaps, option contracts and credit default swaps.

Interest bearing cash securities are valued at amortized cost, which includes cost and accrued interest and approximates fair value.

The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values.  Furthermore, while the Plan believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

15

Table of Contents

Security Transactions and Related Investment Income

Security transactions are recorded on a trade-date basis.  Dividend income is recorded on the ex-dividend date and interest income is recorded on the accrual basis.

The Plan presents in the Statement of Changes in Net Assets Available for Benefits the net change in the fair value of its investments, which consists of realized gains and losses and the unrealized appreciation and depreciation on those investments.

Administrative Expenses and Investment Management Fees

Participants pay for administrative expenses of the Plan which are included in each fund’s expense ratio.  These costs include (a) investment management, custody and benefit responsive investment contracts fees which are charged to the applicable funds and (b) operational expenses required for administration of the Plan including trustee and recordkeeping which are charged against the funds’ assets on a pro rata basis throughout the year.  Operational expenses related to balances in the Mutual Fund Window are deducted from participant account balances. Brokerage fees, and commissions are included in the cost of investments and in determining net proceeds on sales of investments.  Investment management, custody and administrative fees for commingled trusts and mutual funds are charged based on a percentage of net asset value and are paid from the assets of the respective funds.

Standards to be Implemented

In December 2011 and January 2013, the Financial Accounting Standards Board (FASB) issued additional disclosure requirements and amended guidance for offsetting and related arrangements.  These additional requirements will become effective for the year ending December 31, 2013 and are not expected to have a material impact on the Plan’s Financial Statements.

Standards Implemented

In May 2011, the FASB issued amended guidance and disclosure requirements for fair value measurements.  These amendments did  not have a material impact on the Plan’s Financial Statements.

16

Table of Contents

NOTE 3 — INVESTMENTS

The following schedules summarize the fair value of investments within the fair value hierarchy, level 3 gains and losses, investments that represent 5 percent or more of the Plan’s net assets and the related net change in the fair value of investments by type of investment.

The following tables set forth by level, within the fair value hierarchy, the Plan’s investments at fair value at December 31, 2012 and 2011.

Investments at Fair Value as of December 31, 2012

There were no transfers between levels 1 and 2.

17

Table of Contents

Investments at Fair Value as of December 31, 2011

There were no significant transfers between levels 1 and 2.

18

Table of Contents

The Plan has holdings in commingled funds as noted in the tables above.  Generally, under ordinary market conditions, investments by participants in investment funds with underlying holdings in commingled funds provide daily market liquidity to Plan participants and the Plan.  The Plan invests in several commingled funds, in which participant transactions (issuances and redemptions) may occur daily.  Investment in some of these funds may be subject to redemption restrictions, at the commingled fund’s discretion in limited situations.  At December 31, 2012 and 2011, no commingled funds were subject to redemption restrictions.

Level 3 Gains and Losses

The following table presents the changes in the fair value of the plan’s level 3 investments for the year ended December 31, 2012:

*Reported in the net change in fair value of investments in the Statement of Changes in Net Assets Available for Benefits.

**Transferred from Level 2 to Level 3 because observable market data was not available for the securities.

***Transferred from Level 3 to Level 2 because observable market data became available for the securities.

The Plan’s policy is to recognize transfers in and transfers out at the beginning of the period.

19

Table of Contents

Investments — Five Percent or More of Plan’s Net Assets

The investments that represent 5 percent or more of the Plan’s net assets available for benefits at December 31, 2012 and 2011 are as follows:

Net Change in Fair Value of Investments

The following table represents the Net Change in Fair Value of Investments (including gains and losses on investments bought and sold, as well as held during the year):

NOTE 4 — DERIVATIVES

In accordance with the investment strategy of the separately-managed funds and the Interest Income Fund (effective February 29, 2012; previously Stable Value Fund), investment managers execute transactions in various derivative instruments.  These derivative instruments include swaps, options, bond and equity futures and forward contracts.  The use of derivatives is permitted principally to gain or reduce exposure or execute an investment strategy more efficiently.  The investment managers use these derivative instruments to manage duration and interest rate volatility and exposure to credit, currency, equity, and cash.

20

Table of Contents

Within the fixed income funds, the investment managers either sell or purchase credit protection through credit default swaps.  The investment managers also enter into interest rate swap transactions where a series of fixed versus floating rate amounts are exchanged.

Derivatives may be executed on exchange traded investment instruments or via over the counter (OTC) transactions.  When an OTC contract is executed, there is exposure to credit loss in the event of non-performance by the counterparties to these transactions. IBM manages this exposure through the credit criteria included in the investment guidelines and monitors and reports market and counterparty credit risks associated with these instruments. The Plan’s investment managers negotiate and enter into collateral and netting agreements with counterparties on the Plan’s behalf.  In the event of a counterparty default, these agreements reduce the potential loss to the Plan.   These arrangements define the nature of the collateral (cash or U.S. Treasury securities) and the established thresholds for when additional collateral is required by either party. For OTC transactions, the Plan has posted collateral of $23 million and $32 million and received collateral of $11 million and $21 million at December 31, 2012 and 2011, respectively.   In addition, for exchange traded transactions, the Plan has posted $9 million and $21 million of collateral as of December 31, 2012 and 2011, respectively and received no collateral at December 31, 2012 and 2011.  Derivative collateral received is recorded in Investments, at fair value and Payable for collateral deposits in the Statements of Net Assets Available For Benefits.  Derivative collateral posted is recorded in Investments, at fair value in the Statements of Net Assets Available For Benefits.

Market risk arises from the potential for changes in value of financial instruments resulting from fluctuations in interest and foreign exchange rates and in prices of debt and equity securities.  The notional (or contractual) amounts used to express the volume of these transactions do not necessarily represent the amounts potentially subject to market risk.

All derivative financial instruments are carried at fair value.  The net fair value of derivative financial instruments was a liability of $3 million and $14 million as of December 31, 2012 and 2011.

The Plan has authorized Investment Managers to use specific derivative instruments in the implementation of their investment strategy for financial instruments that are managed by the Plan.  The following section discloses how these derivatives may be used, their fair value and financial position at year-end, and the risks associated with each.  Exchange traded derivatives, including futures and options, are regulated by the exchange and approved broker dealers.  OTC derivatives include foreign currency forward contracts, options, and swaps. These transactions will be contracted between two counterparties and governed by separate agreements.  A description of these instruments and the risks are below.

21

Table of Contents

Futures Contracts

Futures contracts are standardized agreements to buy or sell a specific amount of a financial instrument on a future date for a specified price.  Futures are valued based upon their quoted daily price.  The primary risks associated with futures are the accuracy of the correlation between the value of bonds or equities and the price of the futures contracts. Futures contracts may be used to equitize cash and manage exposure to changes in interest rates. Upon entering into a futures contract, the investment manager is required to deposit collateral or initial margin and subsequent margin payments are moved daily depending on the value of the contract. Futures contracts may be subject to risk of loss in excess of the daily variation margin.  They are classified as either interest rate or equity contracts on the derivative instrument tables that follow.

Options Contracts

Options include equity options, index options, options on swaps (swaptions), and options on futures. Options are contracts that give the owner the right, but not the obligation, to buy or sell an asset at a specified price (strike price) on a future date. Options may be purchased or written to help manage exposure to the securities markets. Investment managers may write (sell) call and put options and the premiums received from writing options which expire are treated as realized gains.  Premiums received from a position which is exercised/closed are offset against the amount paid for the underlying security to calculate the gain or loss. An option writer (seller) has no control over whether the underlying instrument may be sold (call) or purchased (put) and bears the market risk of an unfavorable change in the price of the underlying instrument.  Investment managers may also purchase put and call options. Purchasing call options is intended to increase exposure to the underlying instrument, while purchasing put options would tend to decrease exposure to the underlying issue. Premiums paid for purchasing options which expire are realized losses. The risk associated with purchasing put and call options is limited to the premium paid.  Options may be traded on an exchange or OTC.  For OTC options, the Plan could be exposed to risk if the counterparties are unable to meet the terms of the contracts. This risk is mitigated by the posting of collateral by the counterparty and monitored against the contract terms.  Options are classified as interest rate or foreign exchange contracts on the derivative instruments tables that follow.

Foreign Currency Forwards

A foreign currency forward is a contract between two parties to exchange money denominated in one currency into another currency at a set price on a specified future date. Foreign currency forwards are used to hedge the currency exposure, as a part of an investment strategy, or in connection with settling transactions.  Foreign currency contracts may involve market risk in excess of the unrealized gain or loss. Forward transactions are typically not collateralized. The Plan could be exposed to risk if the counterparties are unable to meet the terms of the contracts.

Swap Agreements

Swap agreements are privately negotiated contracts to exchange investment cash flows at a future date based on the underlying value of the assets.   Swap agreements involve elements of credit, market, and documentation risk. The Plan could be exposed to risk if the counterparties are unable to meet the terms of the contracts. This risk is mitigated by the posting of collateral by the counterparty and monitored against the contract terms.  Swap agreements may be centrally cleared or traded OTC.  For OTC swap agreements, the Plan could be exposed to risk if the counterparties are unable to meet the terms of the contracts. This risk is mitigated by the posting of collateral by the counterparty and monitored against the contract terms.  Swap agreements are classified as interest rate or credit contracts on the derivative instruments tables that follow.

22

Table of Contents

Interest Rate Swaps

An Interest rate swap is an agreement in which two parties exchange cash flows based upon a notional principal amount and pay or receive fixed or floating rate amounts of interest. One party exchanges a stream of fixed interest payments for another party’s stream of floating interest payments.  Investment managers may enter into interest rate swap agreements to help hedge against interest rate risk and to maintain its ability to generate income at prevailing market rates. Interest rate swaps expose users to interest rate risk and credit risk.  The notional value of an interest rate swap is not at risk.

Credit Default Swaps

Credit default swaps are agreements where one party (the buyer of protection) makes payments to another party (seller of protection) in exchange for the right to receive a specified return in the event of a default or other credit event.  Investment managers may use credit default swaps to provide a measure of protection against defaults of the issuers or to gain or reduce exposure to a particular credit exposure.  The typical term of an agreement is five years.  If an investment manager is a buyer of protection and a credit event occurs, the portfolio will either receive from the seller of protection an amount equal to the notional amount of the swap or receive a net settlement amount in the form of cash or securities equal to the notional amount of the swap less the recovery value of the referenced obligation.  If an investment manager is a seller of protection and a credit event occurs, the portfolio will either pay to the buyer of protection an amount equal to the notional amount of the swap or pay a net settlement amount in the form of cash or securities equal to the notional amount of the swap less the recovery value of the referenced obligation.  The maximum potential amount of future payments that the Plan as a seller could be required to make is $133 million.  Credit default swaps are considered to have credit risk-related contingent features since they require payment by the protection seller upon the occurrence of a defined credit event.

Total Return Swaps

A Total Return Swap allows one party to derive the economic benefit of owning an asset without putting that asset on its balance sheet, and allows the other party, which does retain the asset on its balance sheet, to buy protection against loss in value.  Investment managers may enter into Total Return Swaps to gain/reduce exposure on the Referenced Asset.   These transactions are primarily found within the commingled commodities fund.

The following tables provide a quantitative summary of the derivative activity as of December 31, 2012 and 2011 and for the year ended December 31, 2012.

23

Table of Contents

Fair Values of Derivative Instruments on Statements of Net Assets Available for Benefits

(Dollars in Thousands)

* Reported in Investments, at fair value

The Effect of Derivative Instruments on the Statement of Changes in Net Assets Available for Benefits

* Reported in Net change in fair value of investments

24

Table of Contents

NOTE 5 — INVESTMENT CONTRACTS

The Plan entered into benefit-responsive synthetic investment contracts (“synthetic GICs”), through the Interest Income Fund (prior to February 29, 2012, Stable Value Fund— “the Fund”), with various third parties, i.e., insurance companies and banks.   Contract value represents contributions made to investment contracts, plus interest at the contract rates, less withdrawals and administrative expenses.  The fair value of the synthetic GICs was determined using a discounted cash flow model which considers recent rebids as determined by recognized dealers, a discount rate and the duration of the underlying portfolio.

A synthetic GIC provides for a fixed return on principal over a specified period of time, e.g., a quarterly crediting rate.  These investment contracts, which are backed by underlying assets owned by the Plan, are issued by third parties and are meant to be fully benefit-responsive.  Synthetic GICs accrue interest using a formula called the “crediting rate.”  Synthetic GICs use the crediting rate formula to smooth and decrease differences over time between the market value of the covered assets and the contract value.  The crediting rate is most impacted by the change in the annual effective yield to maturity of the underlying securities, but is also affected by changes in general level of interest rates and cash flows into or out of the contract.  The difference between the contract value and the market value of the covered assets is amortized over the synthetic GIC’s actual or benchmark duration, in accordance with the contract. A change in duration of the covered assets from reset period to reset period can affect the speed with which any difference is amortized.  Crediting rates are reset quarterly or more often if deemed appropriate.  Synthetic GICs provide a guarantee that the crediting rate will not fall below zero percent.

A synthetic GIC crediting rate, and hence the Fund’s return, may be affected by many factors, including purchases and redemptions by participants.  The precise impact on the synthetic GIC depends on whether the market value of the covered assets is higher or lower than the contract value of those assets.  If the market value of the covered assets is higher than the contract value, the crediting rate will ordinarily be higher than the yield of the covered assets.  Under these circumstances, cash from new investors will tend to lower the crediting rate and the Fund’s return, and redemptions by existing participants will tend to increase the crediting rate and the Fund’s return.  If the market value of the covered assets is less than the contract value, the crediting rate will ordinarily be lower than the yield of the covered assets.  Under these circumstances, cash from new investors will tend to increase the crediting rate and the Fund’s return, and redemptions by existing participants will tend to decrease the crediting rate and the Fund’s return. If the synthetic GIC experiences significant redemptions when the market value is below the contract value, the synthetic GIC’s crediting rate may be reduced significantly, to a level that may not be competitive with other investment options. If redemptions continued, the crediting rate could be reduced to zero.  If the synthetic GIC has insufficient covered assets to meet redemption requests, the Fund would require payments from the investment contract issuer to pay further participant redemptions.

25

Table of Contents

The Fund and the investment contracts purchased by the Fund are designed to pay all participant-initiated transactions at contract value.  Participant-initiated transactions are those transactions allowed by the provisions of the Plan (typically this would include withdrawals for benefits, loans, or transfers to non-competing funds within the Plan).  However, the investment contracts may limit the ability of the Fund to transact at contract value upon the occurrence of certain events.  At this time, the occurrence of any of these events is not probable.  These events include:

·                  The Plan’s failure to qualify under Section 401(a) or Section 401(k) of the Internal Revenue Code.

·                  The establishment of a defined contribution plan that competes with the Plan for employee contributions.

·                  Any substantive modification of the Plan or the administration of the Plan that is not consented to by the investment contract issuer.

·                  Complete or partial termination of the Plan.

·                  Any change in law, regulation or administrative ruling applicable to the Plan that could have a material adverse effect on the Fund’s cash flow.

·                  Merger or consolidation of the Plan with another plan, the transfer of plan assets to another plan, or the sale, spin-off or merger of a subsidiary or division of the plan sponsor.

·                  Any communication given to participants by the Plan sponsor or any other plan fiduciary that is designed to induce or influence participants not to invest in the Fund or to transfer assets out of the Fund.

·                  Exclusion of a group of previously eligible employees from eligibility in the Plan.

·                  Any significant retirement program, group termination, group layoff, facility closing or similar program.

·                  Any transfer of assets from the Fund directly to a competing option, if such transfers are prohibited.

·                  Bankruptcy of the plan sponsor or other plan sponsor events which cause a significant withdrawal from the Plan.

An investment contract issuer may terminate a contract at any time.  In the event that the market value of the covered assets is below the contract value at the time of such termination, the Plan may elect to keep a contract in place to allow for the convergence of the market value and the contract value.  An investment contract issuer may also terminate a contract if certain terms of the investment contract fail to be met.

Investment contracts generally impose conditions on both the Plan and the issuer.  If an event of default occurs and is not cured, the non-defaulting party may terminate the contract.  The following may cause the Plan to be in default: a breach of material obligation under the contract; a material misrepresentation; or a material amendment to the Plan agreement.  The issuer may be in default if it breaches a material obligation under the investment contract; makes a material misrepresentation; is acquired or reorganized.  If, in the event of default of an issuer, the Fund were unable to obtain a replacement investment contract, the Fund may experience losses if the market value of the Plan’s assets no longer covered by the contract is below contract value.  The Fund may seek to add additional issuers over time to diversify the Fund’s exposure to such risk, but there is no assurance the Fund will be able to do so.  The combination of the default of an issuer and an inability to obtain a replacement agreement could render the Fund unable to achieve its objective of maintaining contract value.  The terms of an investment

26

Table of Contents

contract generally provide for settlement of payments only upon termination of the contract or total liquidation of the covered investments.  Generally, payments will be made pro-rata, based on the percentage of investments covered by each issuer.  Contract termination occurs whenever the contract value or market value of the covered investments reaches zero or upon certain events of default.  If the contract terminates when the market value equals zero, the issuer will pay the excess of contract value over market value to the Plan to the extent necessary for the Plan to satisfy outstanding contract value withdrawal requests.  Contract termination also may occur by either party upon election and notice as agreed to under the terms of the contract.

The following table provides the fair value and contract value for the synthetic GICs and the fair value of the underlying assets net of all receivables and payables.

The investment contracts owned by the Interest Income Fund produced the following returns:

NOTE 6 - DESCRIPTION OF INVESTMENT FUNDS

The objectives of the thirty-three primary investment funds in which participants could invest in 2012 are described below:

Life Cycle Funds —

The fourteen Life Cycle funds reflect a portfolio of diversified investments — U.S. stocks, international stocks, real estate equity stocks, and fixed-income investments — from the existing core funds noted below, plus a commodities fund (not available to participants as a standalone offering).  These funds offer a convenient low-cost way to achieve diversification, professional investment management and periodic rebalancing.  The funds are structured by the IBM Retirement Fund organization and managed by the underlying funds’ managers.

Four Life Cycle Funds are Life Strategy Funds that have a preset mix of stock and fixed income investments in order to provide broad diversification at four given levels of exposure to equities.  The preset mix of each Life Strategy Fund is not expected to change over time.

27

Table of Contents

* Exposure to commodities is considered part of the allocation to stocks.

Ten Life Cycle Funds are Target Date Funds that offer portfolios with asset allocations designed for varying retirement dates or the year in which one expects to start drawing on their retirement assets. The portfolios are offered in five year increments from 2005 to 2050, with the 2030 through 2050 funds providing a significantly higher allocation to stocks. As a fund draws closer to its associated target date, the fund will automatically shift toward a more conservative risk level by reducing its allocation to stocks. Each fund’s reduction to stocks continues through its “target date” for another 15 years, until the fund’s allocation and risk profile matches that of the Income Plus Fund. Target Date funds assume a retirement age of 60.

* Exposure to commodities is considered part of the allocation to stocks.

28

Table of Contents

Core Funds - seven funds that provide an opportunity to build a portfolio from a selection of broadly diversified U.S. and international stock funds and from funds that track the fixed-income markets.

Expanded Choice Funds —twelve funds that provide an opportunity to build an investment portfolio with funds that are less broadly diversified, focusing instead on discrete sectors of the stock and bond markets.

29

Table of Contents

IBM 401(k) participants also have access to the “mutual fund window” investments — which expands the Plan’s investment options to include about 165 mutual funds, most of which are actively managed.  This feature gives more options to participants who are interested in investing in brand-name funds, or in simply having a broader range of investment options from which to choose.

In the second quarter of 2013, the target asset allocation in the fourteen Life Cycle funds will change, and the Target Date Funds’ glide path will change so that each fund will reach its final target allocation of 25% stocks and 75% bonds ten years after the target date. The High Yield & Emerging Markets Bond Fund will be added to the Core Funds as will a new Balanced Exposure Fund (available only as an investment in the Life Cycle Funds).  Over time, allocations to the Total Bond Market Fund will replace any Interest Income Fund allocation in the Life Cycle Funds.  Additional information on the Plan’s Investment Funds and these changes is available at: netbenefits.com/IBM.

30

Table of Contents

Securities Lending

The Plan does not currently engage in securities lending for the separate accounts.  Securities lending may be permitted in certain commingled funds and in funds within the IBM Mutual Fund Window.  The prospectus for each fund will disclose if lending is permitted and the risks involved.

Repurchase Agreements

Certain investment managers of separately managed accounts may enter into repurchase agreements with the objective of managing cash in the portfolio.  The repurchase agreements are short-term and managers are limited in the percent of assets which may be invested in them.  Counterparties must meet credit rating requirements and permitted collateral is restricted to cash and/or government securities.  The Plan received $0.3 million of cash collateral and $102 million of securities at December 31, 2012 and $0 million of cash collateral and $118 million of securities at December 31, 2011.  Repurchase agreement cash collateral received is recorded in Investments, at fair value and Payable for collateral deposits in the Statements of Net Assets Available For Benefits. The prospectus of commingled funds or funds within the Mutual Fund Window will disclose if repurchase agreements are permitted.

NOTE 7 - TAX STATUS

The Trust established under the Plan is qualified under Section 401(a) of the Internal Revenue Code of 1986 and Section 1081.01 of the Internal Revenue Code for a New Puerto Rico (2011), and the Trustee intends for the Trust to remain dual-qualified in this manner.  The Plan received a favorable determination letter from the IRS on September 10, 2004, and received a favorable determination letter from the Hacienda (Puerto Rico) on April 29, 1993.  Subsequent to these determination letters by the IRS and the Hacienda, the Plan was amended.  The Plan administrator and Counsel continue to believe the Plan is designed and is being operated in compliance with the applicable requirements of the Internal Revenue Code and the Internal Revenue Code for a New Puerto Rico (2011).  The Plan submitted a request for a new determination letter to the IRS in January 2011 and will submit a request for a new determination letter to the Hacienda in September 2013.

Accounting principles generally accepted in the United States of America require plan management to evaluate tax positions taken by the Plan and recognize a tax liability (or asset) if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the Internal Revenue Service. The Plan administrator has analyzed the tax positions taken by the Plan, and has concluded that as of December 31, 2012, there are no uncertain positions taken or expected to be taken that would require recognition of a liability (or asset) or disclosure in the financial statements. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress.

NOTE 8 - RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500

The following is a reconciliation of net assets available for benefits per the financial statements to the Form 5500 as of:

31

Table of Contents

The following is a reconciliation of investment income per the financial statements to the Form 5500:

NOTE 9 - RELATED-PARTY TRANSACTIONS

At December 31, 2012, a significant portion of the Plan’s assets were managed by State Street Global Advisors.  State Street Global Advisors’ affiliate, State Street Bank and Trust Company, also acts as the trustee for the Plan and, therefore, these investments in addition to participant loans qualify as party-in-interest transactions.  The Plan also pays a fee to the trustee.  These transactions qualify as party-in-interest transactions as well.

In addition, Fidelity Investments Institutional Operations Company, Inc. is the provider of administrative services related to the mutual fund window as well as the investment manager of Fidelity funds within the mutual fund window.  Fidelity is also the provider of record keeping and participant services, and the operator of the IBM Employee Services Center for the IBM 401(k) Plus Plan.

At December 31, 2012 and 2011, the Plan held 13,075,056 and 13,391,892 shares of IBM common stock valued at $2,504,526,977 and $2,462,501,101, respectively.  During the year ended December 31, 2012, purchases of shares by the Plan totaled $179,712,026 and sales of shares by the Plan totaled $246,338,653.

NOTE 10 — SUBSEQUENT EVENT

Effective April 15, 2013, employees hired or rehired into the GBS Application Development Specialist job family on or after April 15, 2013, will be eligible for a matching contribution equal to 2% and automatic contributions equal to 1%, if they meet the following requirements: (1) complete two years of service; and (2) are employed on December 15 of the applicable Plan year. Like all other company contributions made to the Plan, these contributions will be made once annually at the end of the year.

32

Table of Contents

IBM 401(k) PLUS PLAN AT DECEMBER 31, 2012

Schedule G, Part I - Schedule of Loans or Fixed Income Obligations in Default or Classified as Uncollectible