Chih-Hsiang (thompson) Lin - 22 Jul 2025 Form 4 Insider Report for APPLIED OPTOELECTRONICS, INC. (AAOI)

Role: President and CEO, Director
Signature: /s/ David C. Kuo, attorney in fact for Chih-Hsiang (Thompson) Lin
Issuer symbol: AAOI
Transactions as of: 22 Jul 2025
Net transactions value: -$626,988
Form type: 4
Filing time: 24 Jul 2025, 16:01:30 UTC
Previous filing: 14 May 2025
Next filing: 14 Aug 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Lin Chih-Hsiang (Thompson)	President and CEO, Director	C/O APPLIED OPTOELECTRONICS, INC., 13139 JESS PIRTLE BLVD., SUGAR LAND	/s/ David C. Kuo, attorney in fact for Chih-Hsiang (Thompson) Lin	24 Jul 2025	0001587420

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AAOI	Common Stock, $.001 par value	Tax liability	$87,795	-3,110	-0.19%	$28.23	1,655,915	22 Jul 2025	Direct	F1
transaction	AAOI	Common Stock, $.001 par value	Tax liability	$155,011	-5,491	-0.33%	$28.23	1,650,424	22 Jul 2025	Direct	F2
transaction	AAOI	Common Stock, $.001 par value	Tax liability	$247,097	-8,753	-0.53%	$28.23	1,641,671	22 Jul 2025	Direct	F3
transaction	AAOI	Common Stock, $.001 par value	Tax liability	$65,832	-2,332	-0.14%	$28.23	1,639,339	22 Jul 2025	Direct	F4
transaction	AAOI	Common Stock, $.001 par value	Tax liability	$71,253	-2,524	-0.15%	$28.23	1,636,815	22 Jul 2025	Direct	F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Reflects shares surrendered to the Issuer to satisfy tax-withholding obligations upon the vesting of restricted stock unit award granted on June 11, 2021.
F2	Reflects shares surrendered to the Issuer to satisfy tax-withholding obligations upon the vesting of restricted stock unit award granted on June 27, 2022.
F3	Reflects shares surrendered to the Issuer to satisfy tax-withholding obligations upon the vesting of restricted stock unit award granted on June 26, 2023.
F4	Reflects shares surrendered to the Issuer to satisfy tax-withholding obligations upon the vesting of restricted stock unit award granted on April 29, 2024.
F5	Reflects shares surrendered to the Issuer to satisfy tax-withholding obligations upon the vesting of restricted stock unit award granted on April 11, 2025.