Hung-Lun (fred) Chang - 08 Sep 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: 08 Sep 2026
Net transaction value: -$3,545,676
SEC form: 4
Accepted by SEC: 10 Sep 2026, 16:27:31 UTC
Prior SEC filing: 23 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ David C. Kuo, attorney in fact for Hung-Lun (Fred) Chang

Key filing fact

Hung-Lun (fred) Chang filed Form 4 for APPLIED OPTOELECTRONICS, INC. (AAOI) on 10 Sep 2026.

Key facts

This page summarizes Hung-Lun (fred) Chang's Form 4 filing for APPLIED OPTOELECTRONICS, INC. (AAOI).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 10 Sep 2026, 16:27.

Change

Previous filing in this sequence was filed on 23 Jul 2026.
Current net transaction value: -$3,545,676.

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: 10 Sep 2026

Reported non-derivative transactions

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

AAOI transaction

Common Stock, $.001 par value

Sale

Transaction value: $3,545,676
Shares: -32,172
Change %: -11%
Price: $110.21
Shares after: 249,276
Date: 08 Sep 2026
Ownership: Direct
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

The shares were sold in multiple transactions on September 8, 2026 at actual sale prices ranging from $110.00 to $110.76 per share. The price reported reflects the weighted average sale price for the transactions. The reporting person undertakes to provide upon request by SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold during each transaction.

SEC remarks

*** Senior Vice President and North America General Manager