Company: AAOI
Filing Date: 2025-06-02
Form Type: DEFA14A
Source: 0001104659-25-055505
Chunk: 3

Company: APPLIED OPTOELECTRONICS, INC.
Filing Date: 2025-06-02
Form: DEFA14A
Chunk 3
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. Copies of the Proxy Statement and proxy
materials are available at www.proxyvote.com. Information on that website, other than the Proxy Statement and this supplement, is not
incorporated by reference into, and is not a part of, the Proxy Statement or this supplement.

Except as specifically supplemented
below, all information set forth in the Proxy Statement remains unchanged. From and after the date of this supplement, all references
to the “Proxy Statement” are to the Proxy Statement as supplemented hereby.

<div align='center'>2

CHANGES TO PROXY STATEMENT</div>

In addition to the withdrawal
of Withdrawn Proposal No. 4 and conforming updates related to the same, including the renumbering of formerly numbered Proposal No. 5
as Proposal No. 4 — Approval of Amendment of our Certificate of Incorporation to Increase the Number of Authorized
Shares of Capital Stock and Common Stock (and updating the reference to Appendix “C” to Appendix “B”), this supplement
supplements and updates the disclosures in the Proxy Statement as follows:

| 1. | The following paragraph under “The Annual Meeting” beginning on page 2 of the Proxy 
 Statement is amended and restated as follows:                                       |

Proposal No. 4— Approval of Amendment of our Certificate of Incorporation to Increase the Number of Authorized Shares of Capital Stock and Common Stock. The affirmative vote of the holders of a majority of the outstanding shares of capital stock
of the Company entitled to vote thereon shall be required to approve Proposal No. 4. Abstentions will have the same effect as votes
AGAINST Proposal No. 4, and there should be no broker non-votes on Proposal No. 4 because brokers, banks, and other nominees
have discretion to vote uninstructed shares on this proposal, as described in more detail below.

Broker Non-Votes

If your shares are held
in an account at a bank, broker, or other nominee, that bank, broker, or other nominee will have discretion to vote any uninstructed
shares on Proposals No. 2 and 4 as “routine” matters, but will not be permitted to vote your shares of common stock
with respect to Proposals No. 1 and 3 unless you provide instructions as to how your shares should be voted (where no instructions
are provided, this is a “broker non-vote”). If an executed proxy card is returned by a bank, broker, or other nominee holding
shares which indicates that