Sec Form 4 Filing - Lish Scott @ Alphatec Holdings, Inc. - 2026-02-25

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 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 Lish Scott 2. Issuer Name and Ticker or Trading Symbol Alphatec Holdings, Inc. [ ATEC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) CHIEF OPERATING OFFICER (Last) (First) (Middle) C/O ALPHATEC SPINE, INC., 1950 CAMINO VIDA ROBLE 3. Date of Earliest Transaction (MM/DD/YY) 02/25/2026 (Street) CARLSBAD, CA92008 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 ( 1 ) ( 2 ) 02/25/2026 A( 1 ) 311,110 ( 1 ) A $ 0 927,869 ( 3 ) D Common Stock ( 2 ) ( 4 ) 02/25/2026 A( 4 ) 127,378 ( 4 ) A $ 0 1,055,247 D Common Stock ( 2 ) ( 5 ) 02/25/2026 A( 5 ) 20,992 ( 5 ) A 1,076,239 D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Restricted Stock Units ( 6 ) ( 2 ) 02/25/2026 A( 6 ) 63,689 ( 6 ) ( 6 ) ( 6 ) Common Stock 63,689 $ 0 63,689 D Restricted Stock Units ( 7 ) ( 2 ) 02/25/2026 A( 7 ) 63,689 ( 7 ) ( 7 ) ( 7 ) Common Stock 63,689 $ 0 63,689 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Lish Scott C/O ALPHATEC SPINE, INC. 1950 CAMINO VIDA ROBLE CARLSBAD, CA92008 CHIEF OPERATING OFFICER Signatures /s/ Tyson E. Marshall, Attorney-in-Fact 02/27/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On February 25, 2026, the issuer awarded 311,110 restricted stock units (RSUs) to the reporting person under a performance based award granted to the reporting person on January 29, 2025 upon confirmation by the issuer's compensation committee of satisfaction of certain performance criteria for the fiscal year ended December 31, 2025. The RSUs vest in three equal installments on each of March 5, 2026, March 5, 2027 and March 5, 2028. ( 2 )Each RSU represents a contingent right to receive one share of the issuer's common stock. ( 3 )Includes 368 shares acquired under issuer's employee stock purchase plan on November 14, 2025 and also reflects the forfeiture of 25,041 previously reported RSUs for failure to satisfy applicable performance criteria. ( 4 )On February 25, 2026, the issuer awarded 127,378 RSUs to the reporting person. The RSUs vest in three equal installments on each of March 5, 2027, March 5, 2028 and March 5, 2029. ( 5 )On February 25, 2026, the issuer granted 20,992 RSUs to the reporting person in connection with the issuer's election to grant RSUs to the reporting person in lieu of a portion of the reporting person's 2025 cash bonus. The grant was approved and adopted by the issuer's compensation committee on February 25, 2026. The RSUs vest December 4, 2026. The grant amount was determined using the 30-day average trading price of the issuer's common stock as of close of market on February 25, 2026. ( 6 )On February 25, 2026, the issuer granted to the reporting person an award of up to 63,689 performance-based RSUs. The RSUs vest upon the issuer's (i) common stock achieving a 30-day average trading price of at least $25.00 per share at any time prior to December 31, 2028, (ii) common stock achieving a 30-day average trading price of at least $36.00 per share at any time prior to December 31, 2030, (iii) achievement of certain operational metrics determined by the issuer's compensation committee measured as of December 31, 2028, or (iv) achievement of certain operational metrics determined by the issuer's compensation committee measured as of December 31, 2030. ( 7 )On February 25, 2026, the issuer granted to the reporting person an award of up to 63,689 performance-based RSUs. The RSUs vest upon the issuer's (i) common stock achieving a 30-day average trading price of at least $36.00 per share at any time prior to December 31, 2030, or (ii) achievement of certain operational metrics determined by the issuer's compensation committee measured as of December 31, 2030.

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