Company: AAOI
Filing Date: 2025-04-10
Form Type: S-8
Source: 0001104659-25-033793
Chunk: 0

Company: APPLIED OPTOELECTRONICS, INC.
Filing Date: 2025-04-10
Form: S-8
Chunk 0
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<div align='center'>As filed with the Securities and Exchange Commission on April 10, 2025</div>

Registration No. 333-

<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-8

REGISTRATION STATEMENT

Under the Securities Act of 1933

Applied Optoelectronics, Inc.

(Exact name of registrant as specified in its charter)</div>

| Delaware                        |     | 76-0533927            |
| (State or other jurisdiction of 
 incorporation or organization)  |     | -I.R.S. Employer      
 Identification Number |

<div align='center'>13139 Jess Pirtle Blvd.

Sugar Land, TX 77478

(281) 295-1800

(Address, including zip code, and telephone number,
including area code, of Registrant’s principal executive offices)

Applied Optoelectronics, Inc. Amended and Restated 2021 Equity Incentive Plan

(Full title of the plan)

Stefan J. Murry

Chief Financial Officer

Applied Optoelectronics, Inc.

13139 Jess Pirtle Blvd.

Sugar Land, TX 77478
(281) 295-1800

(Name, address, including zip code, and telephone number,
including area code, of agent for service)

Copies to:

David C. Kuo

General Counsel

Applied Optoelectronics, Inc.

13139 Jess Pirtle Blvd.

Sugar Land, TX 77478

(281) 295-1800</div>

Indicate by check mark whether the registrant
is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company.
See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,”
and “emerging growth company” in Rule 12b-2 of the Exchange Act.

| Large             
 accelerated filer | ¨ |     | Accelerated filer         | x |
| Non-accelerated   
 filer             | ¨ |     | Smaller reporting company | ¨ |
|                   |   |     | Emerging growth company   | ¨ |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant