Company: AAOI
Filing Date: 2025-04-25
Form Type: 424B7
Source: 0001104659-25-039431
Chunk: 0

Company: APPLIED OPTOELECTRONICS, INC.
Filing Date: 2025-04-25
Form: 424B7
Chunk 0
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TABLE OF CONTENTS

#### Filed Pursuant to Rule 424(b)(7)​

#### Registration No. 333-283905​

### PROSPECTUS SUPPLEMENT
**(To Prospectus Dated December 18, 2024)**

#### APPLIED OPTOELECTRONICS, INC.

#### 7,945,399 Shares ofCommon Stock
**This prospectus supplement relates to the offer and resale, from time to time, of up to 7,945,399 shares of our common stock, par value $0.001 per share (the “common stock”), that may be issuable upon exercise of the warrant (the “warrant”) held by the selling securityholder (the “selling securityholder”) identified in this prospectus supplement.

The exercise price, and therefore the number of shares of our common stock issuable to the selling securityholder upon exercise of the warrant, is subject to adjustment in certain circumstances. Accordingly, the number of shares of our common stock issuable with respect to the warrant may increase or decrease.

We are not offering or selling any shares of our common stock under this prospectus supplement and will not receive any proceeds from the sale of shares of our common stock covered by this prospectus supplement. We will pay all expenses of the registration of the common stock and certain other fees and expenses incident to the registration of shares of our common stock.

The selling securityholder will act independently in making decisions with respect to the timing, manner and size of any sale or non-sale related transfer. Our registration of the securities covered by this prospectus supplement does not mean that the selling securityholder will offer or sell any of the shares of our common stock offered hereby. The selling securityholder may sell the securities in one or more transactions at the market price for our common stock prevailing at the time of sale, a price related to the prevailing market price, a negotiated price or such other price as the selling securityholder determines from time to time. See “Plan of Distribution.”

Our common stock is listed on the NASDAQ Global Market (“NASDAQ”) under the symbol “AAOI.” On April 24, 2025, the closing price of our common stock on NASDAQ was $12.79 per share.

Investing in our common stock involves risks. See “Risk Factors” beginning on page S-4of this prospectus supplement and in the documents incorporated by reference in this prospectus supplement and the accompanying prospectus for a description of risks you should consider when evaluating such investment.

Neither the Securities and Exchange