Company: AAOI
Filing Date: 2025-02-28
Form Type: 424B5
Source: 0001104659-25-019109
Chunk: 2

Company: APPLIED OPTOELECTRONICS, INC.
Filing Date: 2025-02-28
Form: 424B5
Chunk 2
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13 | ​ | ​ |
| Incorporation of Certain Documents By Reference      | ​ | ​ | ​    | ​ | S-14 | ​ | ​ |

PROSPECTUS

| ​                                                    | ​ | ​ | Page |   |    |   | ​ |
| 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 | ​ | ​ |

S-i

TABLE OF CONTENTS

### ABOUT THIS PROSPECTUS SUPPLEMENT
This prospectus supplement is part of a registration statement that we filed with the Securities and Exchange Commission, or the SEC, using a “shelf” registration process. Under this prospectus supplement, and the accompanying base prospectus, we may offer shares of our common stock having an aggregate offering price of up to $100,000,000 from time to time at prices and on terms to be determined by market conditions at the time of the offering.

We provide information to you about this offering of shares of our common stock in two separate documents that are bound together: (1) this prospectus supplement, which describes the specific details regarding this offering; and (2) the accompanying base prospectus, which provides general information, some of which may not apply to this offering. Generally