Company: AAOI
Filing Date: 2025-04-02
Form Type: DEFA14A
Source: 0001104659-25-030933
Chunk: 0

Company: APPLIED OPTOELECTRONICS, INC.
Filing Date: 2025-04-02
Form: DEFA14A
Chunk 0
---
<div align='center'>UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a)
of
the Securities Exchange Act of 1934 (Amendment No. )</div>

Filed by the Registrant x

Filed by a Party other than the Registrant ¨

Check the appropriate box:

| ¨ | Preliminary Proxy Statement                                                     |
| ¨ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ¨ | Definitive Proxy Statement                                                      |
| x | Definitive Additional Materials                                                 |
| ¨ | Soliciting Material under §240.14a-12                                           |

<div align='center'>APPLIED OPTOELECTRONICS,
INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other
than the Registrant)</div>

Payment of Filing Fee (Check the appropriate box):

| x | No fee required.                                                                                    |
| ¨ | Fee paid previously with preliminary materials.                                                     |
| ¨ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

<div align='center'>APPLIED OPTOELECTRONICS, INC.

13139 Jess Pirtle Blvd., Sugar Land, TX 77478

SUPPLEMENT TO PROXY STATEMENT FOR

THE SPECIAL MEETING OF STOCKHOLDERS

TO BE HELD ON APRIL 10, 2025</div>

On April 2, 2025, the Board
of Directors of Applied Optoelectronics, Inc. (the “Company”) approved an amendment to the Company’s Amended and Restated
By-laws to reduce the quorum needed for any special meeting of stockholders to one-third (33.33%) of the Company’s voting power
of the issued and outstanding shares of capital stock of the Company entitled to vote thereat, present in person or represented by proxy.
This amendment does not affect the quorum requirement for annual meetings of stockholders, which remains unchanged. The new quorum requirement
will apply to the Special Meeting of Stockholders (the “Special Meeting”) to be held on Thursday, April 10, 2025, at 9:30
a.m. Central Time, at the Company’s principal