Company: AAOI
Filing Date: 2025-11-07
Form Type: 424B5
Source: 0001104659-25-108494
Chunk: 20

Company: APPLIED OPTOELECTRONICS, INC.
Filing Date: 2025-11-07
Form: 424B5
Chunk 20
---
 our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed with the SEC on February 23, 2024, including any amendment or reports filed for the purpose of updating such description.

In addition, all documents subsequently filed by us pursuant to Section 13(a), 13(c), 14 and 15(d) of the Exchange Act after the date of this prospectus supplement and prior to the filing of a post-effective amendment to the registration statement that indicates that all securities offered have been sold or that deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference into this prospectus supplement and to be a part hereof from the date of filing of such documents. Any statement contained in a document incorporated by reference herein shall be deemed to be modified or superseded for purposes of this registration statement to the extent that a statement contained herein or in any other subsequently filed document that is incorporated by reference herein modifies or supersedes such earlier statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus supplement.

Nothing in this prospectus supplement shall be deemed to incorporate information furnished but not filed with the SEC pursuant to Item 2.02 or Item 7.01 of Form 8-K.

We will provide, without charge, upon written or oral request of any person to whom a copy of this prospectus supplement is delivered, a copy of any or all of the foregoing documents and information that has been or may be incorporated in this prospectus supplement by reference, other than exhibits to such documents. Requests for such documents and information should be directed to:

<div align='center'>S-14</div>

TABLE OF CONTENTS

<div align='center'>Applied Optoelectronics, Inc. 
 Attn: Dr. Stefan Murry, Chief Financial Officer 
 13139 Jess Pirtle Blvd. 
 Sugar Land, TX 77478 
 (281) 295-1800</div>

You may also access the documents incorporated by reference in this prospectus supplement through our website at http://ao-inc.com/ ​. Except for the specific incorporated documents listed above, no information available on or through our website shall be deemed to be incorporated in this prospectus supplement.

<div align='center'>S-15</div>

TABLE OF CONTENTS

#### Prospectus

#### APPLIED OPTOELECTRONICS, INC.

#### Common Stock

#### Preferred Stock