Company: AAOI
Filing Date: 2025-04-25
Form Type: 424B7
Source: 0001104659-25-039431
Chunk: 14

Company: APPLIED OPTOELECTRONICS, INC.
Filing Date: 2025-04-25
Form: 424B7
Chunk 14
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 any selling securityholder will sell any or all of the shares of our common stock registered pursuant to the registration statement of which this prospectus supplement is a part.

In no event may the method of distribution by the selling securityholder take the form of an underwritten offering of the shares of our common stock without the prior agreement of the Company.

Once sold under the registration statement of which this prospectus supplement forms a part, the shares of our common stock will be freely tradable in the hands of persons other than our affiliates.

### LEGAL MATTERS
Certain legal matters will be passed upon for us by Norton Rose Fulbright US LLP, Houston, Texas.

### WHERE YOU CAN FIND MORE INFORMATION
We file annual, quarterly and current reports, proxy statements and other information with the SEC under the Exchange Act. Our SEC filings are available to you, free of charge, on the SEC’s website at https://www.sec.gov. You may also obtain additional information by visiting our website at http://ao-inc.com. The information found on, or otherwise accessible through, our website is not incorporated into, and does not form a part of this prospectus supplement or any other report or document we file with or furnish to the SEC.

### INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
The SEC allows us to “incorporate by reference” into this prospectus the information we file with them, which means that we can disclose important information to you by referring you to those documents. The information that we incorporate by reference into this prospectus is considered to be part of this prospectus, and information that we file later with the SEC automatically updates and supersedes any information in this prospectus. We have filed the following documents with the SEC. These documents are incorporated by reference as of their respective dates of filing, as well as any future documents (excluding information furnished pursuant to Items 2.02 and 7.01 of Form 8-K) we file with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended, subsequent to the date of this prospectus and prior to the termination of the offering:

•

our Annual Report on Form 10-K for the year ended December 31, 2024, as filed with the SEC on February 28, 2025;

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our Current Reports on Form 8-K, filed on February 28, 2025, March 13, 2025, April