FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * L-5 Healthcare Partners, LLC   2. Issuer Name and Ticker or Trading Symbol Alphatec Holdings, Inc. [ATEC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) __X__ Other (specify below) Director by deputization (Last) (First) (Middle) C/O LS POWER DEVELOPMENT, LLC, 1700 BROADWAY, 35TH FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 05/17/2018 (Street) NEW YORK, NY 10019 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/17/2018   C   7,936,508 A (1) 7,936,508 D (2) (3)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Series B Convertible Preferred Stock

(1)

05/17/2018

C

25,000

(1)

(1)

Common Stock

7,936,508

$ 0

0

D (2) (3)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
L-5 Healthcare Partners, LLC C/O LS POWER DEVELOPMENT, LLC 1700 BROADWAY, 35TH FLOOR NEW YORK, NY 10019		X		Director by deputization
Segal Paul C/O LS POWER DEVELOPMENT, LLC 1700 BROADWAY, 35TH FLOOR NEW YORK, NY 10019		X		Director by deputization

Signatures

L-5 Healthcare Partners, LLC, /s/ Paul Segal, Manager		05/21/2018
**Signature of Reporting Person		Date
/s/ Paul Segal		05/21/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	The Series B Convertible Preferred Stock automatically converted into 7,936,508 shares of Common Stock upon approval by the issuer's stockholders on May 17, 2018.
(2)	Each of Jason Hochberg and Evan Bakst serve on the board of directors of the issuer as a representative of the reporting persons. As a result, each reporting person herein may be deemed a director by deputization for the purposes of Section 16 of the Exchange Act.
(3)	Paul Segal directly (through his position as manager of L-5 Healthcare Partners, LLC ("L-5")) may be deemed to control L-5 and to have shared voting and investment power with respect to the shares beneficially owned by L-5. As such, Mr. Segal may be deemed to have shared beneficial ownership of the shares beneficially owned by L-5. Mr. Segal, however, disclaims beneficial ownership of such shares, except to the extent of his indirect pecuniary interest therein.

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