{"url_path":"/sec/axti/proxy/2026-05-18/000121390026058419","section_key":"body","section_title":"DEFA14A body","topic":"sec","document":{"doc_type":"DEFA14A","doc_date":"2026-05-18","source_url":"https://www.sec.gov/Archives/edgar/data/1051627/0001213900-26-058419-index.html","accession_number":"0001213900-26-058419","cik":"0001051627","ticker":"AXTI","issuer_name":"AXT INC","edgar_url":"https://www.sec.gov/Archives/edgar/data/1051627/0001213900-26-058419-index.html","primary_entity_key":"0001051627","primary_entity_name":"AXT INC"},"word_count":533,"has_tables":true,"body_markdown":"DEFA14A\n1\nea0291245-defa14a_axt.htm\nDEFINITIVE ADDITIONAL MATERIALS\n\n**UNITED STATES**\n\n**SECURITIES AND EXCHANGE COMMISSION**\n\n**Washington, D.C. 20549**\n\n**SCHEDULE 14A**\n\nPROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE\n\nSECURITIES EXCHANGE ACT OF 1934\n\nFiled by the Registrant ☒\n\nFiled by a Party other than the Registrant ☐\n\n**Check the appropriate box:**\n\n☐\nPreliminary Proxy Statement\n\n☐\nConfidential, for Use of the Commission only (as permitted by Rule 14a-6(e)(2))\n\n☐\nDefinitive Proxy Statement\n\n☒\nDefinitive Additional Materials\n\n☐\nSoliciting Material Pursuant to § 240.14a-11(c) or § 240.14a-12\n\n**AXT,\nINC.**\n\n**(Name of Registrant as Specified In Its Charter)**\n\n**(Name of Person(s) Filing Proxy Statement if\nOther Than the Registrant)**\n\n**Payment of Filing Fee (Check all boxes that\napply):**\n\n☒\nNo fee required\n\n☐\nFee paid previously with preliminary materials\n\n☐\nFee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11\n\n** **\n\n**EXPLANATORY NOTE**\n\nAttached hereto is a letter\nfrom AXT, Inc. (the “Company”) to Company stockholders of record as of March 20, 2026 (“Record Date Stockholders”)\nwho had yet to vote their shares in connection with the Company’s 2026 Annual Meeting of Stockholders, which was held on May 14,\n2026 and adjourned until June 4, 2026. The letter, and the related proxy card, was mailed on or after the date of this filing.\n\nThe letter supplements the\nDefinitive Proxy Statement and the Definitive Additional Materials filed with the SEC on March 31, 2026, and the Definitive Additional\nMaterials filed with the SEC on May 15, 2026.\n\n** **\n\n**AXT Inc. Announces Adjournment of Annual\nMeeting of Stockholders**\n\nAXT Inc. (“AXT”) announced that its\nAnnual Meeting of Stockholders (the “Annual Meeting”) held on May 14, 2026 has been adjourned to June 4, 2026 to allow stockholders\nwith additional time to vote.\n\nAs of the date of this letter, your shares of AXT currently remains\nunvoted.\n\nWe urge our stockholders who have not yet voted\ntheir shares to please do so. This will help save us further solicitation costs and ensure that your important vote is represented.\n\n** **\n\n**Please vote your shares of AXT common stock now so that your\nvote can be counted without delay.**Voting is easy. You may use one of the options below to ensure that your vote is promptly recorded\nin time for the Annual Meeting:\n\n●**VOTE BY TOUCH-TONE PHONE:** You may cast your vote by calling the toll-free number on the enclosed proxy card. Follow\nthe instructions on your proxy card to cast your vote.\n\n●**VOTE VIA THE INTERNET:** You may cast your vote by logging onto the website identified on the enclosed proxy card and\nfollowing the instructions on the screen.\n\n●**VOTE BY MAIL:** You may cast your vote by mail by completing, signing, dating and mailing the enclosed proxy card in the\npostage-prepaid return envelope provided.\n\nIf you have any questions or require further assistance in voting your\nshares, please contact our proxy solicitor Alliance Advisors toll-free at 1-866-206-7723 or by emailing AXTI@AllianceAdvisors.com.\n\nWe thank you for your continued support of AXT.\n\nSincerely,\n\n/s/ Gary L. Fischer\n\nGary L. Fischer\n\nChief Financial Officer and Corporate Secretary\n\n**IF YOU HAVE RECENTLY MAILED YOUR PROXY CARD\nOR CAST YOUR VOTE BY**\n\n**PHONE OR INTERNET, PLEASE\nACCEPT OUR THANKS AND DISREGARD THIS REQUEST.**"}