DEFA14A

DEFA14A 1 atec_2026_proxy_naa_no.x.htm DEFA14A DEFA14A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934 (Amendment No.)

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☐ Preliminary Proxy Statement

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☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

Alphatec Holdings, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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P.O. BOX 8016, CARY, NC 27512-9903 Your vote Alphatec Holdings, Inc. Annual Meeting of Stockholders Wednesday, June 11, 2025 10:00 AM, Pacific Time ATEC Spine, Inc. 1950 Camino Vida Roble, Carlsbad, CA 92008 Meeting Materials: Notice of Meeting and Proxy Statement & Annual Report or Form 10-K Important Notice Regarding the Availability of Proxy Materials for the Stockholders Meeting To Be Held On June 11, 2025 For Stockholders of record as of April 16, 2025 To order paper materials, use one of the following methods. For a convenient way to view proxy materials, VOTE, and obtain directions to attend the meeting go to www.proxydocs.com/ATEC To vote your proxy while visiting this site, you will need the 12 digit control number in the box below. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. This is not a ballot. You cannot use this notice to vote your shares. We encourage you to access and review all of the important information contained in the proxy materials before voting. Under United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper. Proxy materials can be distributed by making them available on the internet. If you want to receive a paper or e-mail copy of the proxy material, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for this year's meeting, you must make this request on or before June 30, 2025. Internet: www.investorelections.com/ATEC Call: 1-866-648-8133 Email: paper@investorelections.com * If requesting material by e-mail, please send a blank e-mail with the 12 digit control number (located below) in the subject line. No other requests, instructions OR other inquiries should be included with your e-mail requesting material. Have the 12 digit control number located in the box above available when you access the website and follow the instructions. SEE REVERSE FOR FULL AGENDA

Copyright 2025 BetaNXT, Inc. or its affiliates. All Rights Reserved Alphatec Holdings, Inc. Annual Meeting of Stockholders THE BOARD OF DIRECTORS RECOMMENDS A VOTE: FOR ON PROPOSALS 1, 2, 3, 4 AND 5 1. To elect nine persons to our Board of Directors 1.01 Mortimer Berkowitz III 1.02 Quentin Blackford 1.03 David Demski 1.04 Karen K. McGinnis 1.05 Patrick S. Miles 1.06 David R. Pelizzon 1.07 Jeffery P. Rydin 1.08 Keith Valentine 1.09 Ward W. Woods 2. To ratify the selection of Deloitte & Touche LLP as our independent registered public accounting firm for our fiscal year ending December 31, 2025. 3. Approval of an amendment to our 2016 Equity Incentive Plan. 4. Approval of an amendment to our Certificate of Incorporation. 5. To approve, on an advisory basis, the compensation of our named executive officers.

SEC Form DEFA14A filed by Alphatec Holdings Inc.