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Your Vote Counts! *Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Smartphone users Point your camera here and vote without entering a control number For complete information and to vote, visit www.ProxyVote.com Control # V47593-P11823 APPLIED OPTOELECTRONICS, INC. ATTN: LEGAL DEPARTMENT 13139 JESS PIRTLE BLVD. SUGAR LAND, TX 77478 APPLIED OPTOELECTRONICS, INC. 2024 Annual Meeting Vote by June 5, 2024 11:59 PM ET You invested in APPLIED OPTOELECTRONICS, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on June 6, 2024. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 23, 2024. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Vote in Person at the Meeting* June 6, 2024 9:30 A.M. Central Time 13139 Jess Pirtle Blvd. Sugar Land, TX 77478


Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. V47594-P11823 Voting Items Board Recommends THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. 1. Class II Directors for Election: For Nominees: 01) William H. Yeh 02) Cynthia (Cindy) DeLaney 2. To ratify the appointment of Grant Thornton LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2024. For 3. To approve, on an advisory basis, the compensation of our named executive officers. For 4. To approve, on an advisory basis, the frequency of future advisory votes on the compensation of our named executive officers. 1 Year 5. To approve our 2021 Equity Incentive Plan, as amended to increase the number of shares of Common Stock reserved for issuance thereunder by 2,000,000 shares and increase certain annual limits on the value of awards. For 6. To approve a portion of the award of performance-vesting restricted stock units (PSUs) granted to our Chief Executive Officer in June 2023 with respect to 355,871 shares at target level performance, which portion exceeded the annual limit on the value of awards granted under our 2021 Equity Incentive Plan. For NOTE: In their discretion, the Proxies are authorized to vote upon such other business as may properly come before the meeting or any adjournment or postponement of the meeting.