Company: AAOI
Filing Date: 2025-11-07
Form Type: 424B5
Source: 0001104659-25-108494
Chunk: 1

Company: APPLIED OPTOELECTRONICS, INC.
Filing Date: 2025-11-07
Form: 424B5
Chunk 1
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 our behalf, the Agents may be deemed to be a “underwriters” within the meaning of the Securities Act and the compensation of the Agents may be deemed to be underwriting commissions or discounts. We have also agreed to provide indemnification and contribution to the Agents with respect to certain liabilities, including liabilities under the Securities Act and the Securities Exchange Act of 1934, as amended, or Exchange Act.

INVESTING IN OUR SECURITIES INVOLVES SIGNIFICANT RISKS. YOU SHOULD REVIEW CAREFULLY THE “RISK FACTORS” BEGINNING ON PAGE**

#### S-5
**OF THIS PROSPECTUS SUPPLEMENT AND UNDER SIMILAR HEADINGS IN THE OTHER DOCUMENTS THAT ARE INCORPORATED BY REFERENCE INTO THIS PROSPECTUS SUPPLEMENT BEFORE INVESTING IN OUR SECURITIES.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.**

### RAYMOND JAMESNEEDHAM & COMPANY

#### T

#### he date of this prospectus supplement is

#### N

#### ovember 7, 2025.
TABLE OF CONTENTS

TABLE OF CONTENTS PROSPECTUS SUPPLEMENT

| ​                                                    | ​ | ​ | Page |   |      |   | ​ |
| About This Prospectus Supplement                     | ​ | ​ | ​    | ​ | S-1  | ​ | ​ |
| Prospectus Supplement Summary                        | ​ | ​ | ​    | ​ | S-2  | ​ | ​ |
| The Offering                                         | ​ | ​ | ​    | ​ | S-4  | ​ | ​ |
| Risk Factors                                         | ​ | ​ | ​    | ​ | S-5  | ​ | ​ |
| Cautionary Note Regarding Forward-Looking Statements | ​ | ​ | ​    | ​ | S-8  | ​ | ​ |
| Use Of Proceeds                                      | ​ | ​ | ​    | ​ | S-9  | ​ | ​ |
| Dilution                                             | ​ | ​ | ​    | ​ | S-10 | ​ | ​ |
| Plan of Distribution                                 | ​ | ​ | ​    | ​ | S-11 | ​ | ​ |
| Legal Matters                                        | ​ | ​ | ​    | ​ | S-13 | ​ | ​ |
| Experts                                              | ​ | ​