Additional Proxy Soliciting Materials (Form DEFA14A)

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Signature [PLEASE SIGN WITHIN BOX] Date Signature (Joint Owners) DateTO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS:KEEP THIS PORTION FOR YOUR RECORDSTHIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED. DETACH AND RETURN THIS PORTION ONLYAPPLIED OPTOELECTRONICS, INC.ATTN: LEGAL DEPARTMENT13139 JESS PIRTLE BLVD.SUGAR LAND, TX 77478VOTE BY INTERNET - www.proxyvote.com or scan the QR Barcode aboveUse the Internet to transmit your voting instructions and for electronic delivery of information. Vote by 11:59 P.M. ET on June 3, 2026. Have your proxy card in hand when you access the web site and follow the instructions to obtain your records and to create an electronic voting instruction form.ELECTRONIC DELIVERY OF FUTURE PROXY MATERIALSIf you would like to reduce the costs incurred by our company in mailing proxy materials, you can consent to receiving all future proxy statements, proxy cards and annual reports electronically via e-mail or the Internet. To sign up for electronic delivery, please follow the instructions above to vote using the Internet and, when prompted, indicate that you agree to receive or access proxy materials electronically in future years.VOTE BY PHONE - 1-800-690-6903Use any touch-tone telephone to transmit your voting instructions. Vote by 11:59 P.M. ET on June 3, 2026. Have your proxy card in hand when you call and then follow the instructions.VOTE BY MAILMark and sign and date your proxy card and return it in the postage-paid envelope we have provided or return it to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, NY 11717.T00440-P50354! ! !For All Withhold AllFor All ExceptFor Against Abstain! ! !! ! !! ! !! ! !To withhold authority to vote for any individual nominee(s), mark "For All Except" and write the number(s) of the nominee(s) on the line below.APPLIED OPTOELECTRONICS, INC.1. Class I Directors for Election: Nominees:The Board of Directors recommends you vote FOR the following:NOTE: In their discretion, the Proxies (or their substitutes) are authorized to vote upon such other business as may properly come before the meeting or any adjournment or postponement of the meeting including, without limitation, procedural and other matters related to the conduct of the meeting (such as adjournment to a later time or place) and the election of a substitute or alternate nominee if any nominee named above is unwilling or unable to, or for good cause will not, serve if elected.Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator, or other fiduciary, please give full title as such. Joint owners should each sign personally. If a corporation, limited liability company, or partnership, please sign in full corporate, limited liability company, or partnership name by authorized officer or person.01) Che-Wei Lin02) Robert (Bob) Flanagan2. To ratify the appointment of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2026.3. To approve, on an advisory basis, the compensation of our named executive officers.4. To approve the amendment of our Amended and Restated Certificate of Incorporation, as amended, to clarify the voting standard that applies to certain future amendments.5. To approve the 2026 equity incentive plan.6. To approve an adjournment of the Annual Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies in the event that there are insufficient votes for, or otherwise in connection with, one or more of the other proposals to be voted on at the Annual Meeting.The Board of Directors recommends you vote FOR proposals 2, 3, 4, 5 and 6.! ! !SCAN TO VIEW MATERIALS & VOTE w

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T00441-P50354Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting: The Notice and Proxy Statement and Annual Report are available at www.proxyvote.com.APPLIED OPTOELECTRONICS, INC.Annual Meeting of StockholdersJune 4, 2026 9:30 A.M. Central TimeThis proxy is solicited by the Board of DirectorsThe stockholder(s), revoking all prior proxies heretofore given, hereby appoint(s) Chih-Hsiang (Thompson) Lin and David Kuo, and each of them, as proxies, each with the power to appoint his substitute and to act alone, and hereby authorize(s) them to represent and to vote, as designated on the reverse side hereof, all of the shares of common stock of APPLIED OPTOELECTRONICS, INC. that the stockholder(s) is/are entitled to vote if the stockholder(s) was/were present at the Annual Meeting of Stockholders to be held at 9:30 A.M. Central Time on June 4, 2026, at 13139 Jess Pirtle Blvd., Sugar Land, TX 77478, and any adjournment or postponement thereof.This proxy, when properly executed, will be voted in the manner directed herein. If no such direction is made, this proxy will be voted FOR each of the nominees listed in Proposal 1, FOR Proposals 2, 3, 4, 5 and 6.Continued and to be signed on reverse side