Hung-Lun (fred) Chang - 22 Jul 2025 Form 4 Insider Report for APPLIED OPTOELECTRONICS, INC. (AAOI)

Role: *** Senior Vice President and North America General Manager.
Signature: /s/ David C. Kuo, attorney in fact for Hung-Lun (Fred) Chang
Issuer symbol: AAOI
Transactions as of: 22 Jul 2025
Net transactions value: -$190,044
Form type: 4
Filing time: 24 Jul 2025, 16:01:37 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
Chang Hung-Lun (Fred)	*** Senior Vice President and North America General Manager.	C/O APPLIED OPTOELECTRONICS, INC., 13139 JESS PIRTLE BLVD., SUGAR LAND	/s/ David C. Kuo, attorney in fact for Hung-Lun (Fred) Chang	24 Jul 2025	0001587462

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AAOI	Common Stock, $.001 par value	Tax liability	$27,270	-966	-0.35%	$28.23	277,876	22 Jul 2025	Direct	F1
transaction	AAOI	Common Stock, $.001 par value	Tax liability	$48,104	-1,704	-0.61%	$28.23	276,172	22 Jul 2025	Direct	F2
transaction	AAOI	Common Stock, $.001 par value	Tax liability	$75,515	-2,675	-0.97%	$28.23	273,497	22 Jul 2025	Direct	F3
transaction	AAOI	Common Stock, $.001 par value	Tax liability	$17,305	-613	-0.22%	$28.23	272,884	22 Jul 2025	Direct	F4
transaction	AAOI	Common Stock, $.001 par value	Tax liability	$21,850	-774	-0.28%	$28.23	272,110	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.

Remarks:

*** Senior Vice President and North America General Manager.