Company: AAOI
Filing Date: 2025-11-07
Form Type: 424B5
Source: 0001104659-25-108494
Chunk: 51

Company: APPLIED OPTOELECTRONICS, INC.
Filing Date: 2025-11-07
Form: 424B5
Chunk 51
---
 this prospectus is delivered, a copy of any or all of the foregoing documents and information that has been or may be incorporated in this prospectus by reference, other than exhibits to such documents. Requests for such documents and information should be directed to:

<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 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 or the registration statement of which it forms a part.

See also “Where to Learn More About Us.”

<div align='center'>19</div>

TABLE OF CONTENTS

<div align='center'>**$**</div>

#### 180,000,000

#### CommonStock

### PROSPECTUS SUPPLEMENT

### RAYMOND JAMESNEEDHAM & COMPANY
<div align='center'>November 7, 2025</div>