Company: AAOI
Filing Date: 2025-08-27
Form Type: 424B5
Source: 0001104659-25-084005
Chunk: 23

Company: APPLIED OPTOELECTRONICS, INC.
Filing Date: 2025-08-27
Form: 424B5
Chunk 23
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 IN THE PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.**

<div align='center'>The date of this prospectus is December 18, 2024.</div>

TABLE OF CONTENTS

TABLE OF CONTENTS

| ​ | ABOUT THIS PROSPECTUS                                | ​ | ​ | ​ | ​ |  1 | ​ | ​ |
| ​ | RISK FACTORS                                         | ​ | ​ | ​ | ​ |  2 | ​ | ​ |
| ​ | THE COMPANY                                          | ​ | ​ | ​ | ​ |  2 | ​ | ​ |
| ​ | CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS | ​ | ​ | ​ | ​ |  3 | ​ | ​ |
| ​ | USE OF PROCEEDS                                      | ​ | ​ | ​ | ​ |  4 | ​ | ​ |
| ​ | DESCRIPTION OF SECURITIES TO BE OFFERED              | ​ | ​ | ​ | ​ |  4 | ​ | ​ |
| ​ | PLAN OF DISTRIBUTION                                 | ​ | ​ | ​ | ​ | 13 | ​ | ​ |
| ​ | LEGAL MATTERS                                        | ​ | ​ | ​ | ​ | 17 | ​ | ​ |
| ​ | EXPERTS                                              | ​ | ​ | ​ | ​ | 17 | ​ | ​ |
| ​ | WHERE TO LEARN MORE ABOUT US                         | ​ | ​ | ​ | ​ | 17 | ​ | ​ |
| ​ | INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE      | ​ | ​ | ​ | ​ | 18 | ​ | ​ |

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TABLE OF CONTENTS

### ABOUT THIS PROSPECTUS
This prospectus is part of an “automatic shelf” registration statement on Form S-3 that we filed with the Securities and Exchange Commission (the “SEC”), as a “well-known seasoned issuer” as defined in Rule 405 under the Securities Act of 1933, as amended, or the Securities Act, utilizing a “shelf” registration process. Under the shelf registration process, we or the selling securityholders may offer and sell either individually or in combination with other securities any of the securities described in this prospectus, from time to time, in one or more offerings, at prices and on terms to be determined at or prior to the applicable offering.

This prospectus only provides you with a general description of the securities we may offer