Company: AAOI
Filing Date: 2025-05-28
Form Type: 424B5
Source: 0001104659-25-053547
Chunk: 23

Company: APPLIED OPTOELECTRONICS, INC.
Filing Date: 2025-05-28
Form: 424B5
Chunk 23
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CHANGE COMMISSION, AS DESCRIBED IN “RISK FACTORS” ON PAGE 2. YOU SHOULD CAREFULLY CONSIDER THOSE RISK FACTORS BEFORE INVESTING.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE ACCURACY OR ADEQUACY OF THE DISCLOSURES 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