Hung-Lun (fred) Chang - 22 Oct 2026 Form 4 Insider Report for APPLIED OPTOELECTRONICS, INC. (AAOI)

Reporting relationship: *** Senior Vice President and North America General Manager
Issuer ticker: AAOI
Reported as of: 22 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 26 Oct 2026, 16:05:11 UTC
Prior SEC filing: 10 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ David C. Kuo, attorney in fact for Hung-Lun (Fred) Chang

Filing notes and source

Key filing fact

Hung-Lun (fred) Chang filed Form 4 for APPLIED OPTOELECTRONICS, INC. (AAOI) on 26 Oct 2026.

Key facts

This page summarizes Hung-Lun (fred) Chang's Form 4 filing for APPLIED OPTOELECTRONICS, INC. (AAOI).
4 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 26 Oct 2026, 16:05.

Change

Previous filing in this sequence was filed on 10 Sep 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001587462 Primary reporting owner

Chang Hung-Lun (Fred)

Relationship: *** Senior Vice President and North America General Manager
Address: C/O APPLIED OPTOELECTRONICS, INC., 13139 JESS PIRTLE BLVD., SUGAR LAND
Signature: /s/ David C. Kuo, attorney in fact for Hung-Lun (Fred) Chang
Signature date: 26 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AAOI transaction

Common Stock, $.001 par value

Tax liability

Transaction value
Shares: -2,940
Change %: -1.2%
Price: $77.32^*
Shares after: 246,336
Date: 22 Oct 2026
Ownership: Direct
Footnotes: F1

AAOI transaction

Common Stock, $.001 par value

Tax liability

Transaction value
Shares: -674
Change %: -0.27%
Price: $77.32^*
Shares after: 245,662
Date: 22 Oct 2026
Ownership: Direct
Footnotes: F2

AAOI transaction

Common Stock, $.001 par value

Tax liability

Transaction value
Shares: -850
Change %: -0.35%
Price: $77.32^*
Shares after: 244,812
Date: 22 Oct 2026
Ownership: Direct
Footnotes: F3

AAOI transaction

Common Stock, $.001 par value

Tax liability

Transaction value
Shares: -677
Change %: -0.28%
Price: $77.32^*
Shares after: 244,135
Date: 22 Oct 2026
Ownership: Direct
Footnotes: F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

Reflects shares surrendered to the Issuer to satisfy tax-withholding obligations upon the vesting of restricted stock unit award granted on June 26, 2023.

Footnote F2

Reflects shares surrendered to the Issuer to satisfy tax-withholding obligations upon the vesting of restricted stock unit award granted on April 29, 2024.

Footnote F3

Reflects shares surrendered to the Issuer to satisfy tax-withholding obligations upon the vesting of restricted stock unit award granted on April 11, 2025.

Footnote F4

Reflects shares surrendered to the Issuer to satisfy tax-withholding obligations upon the vesting of restricted stock unit award granted on February 9, 2026.

SEC remarks

*** Senior Vice President and North America General Manager