Hung-Lun (Fred) Chang - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Hung-Lun (Fred) Chang has filed 5 SEC Form 4 filings across 1 company in the last 90 days - selling. Lifetime open-market sales: $24.69M.
Profile
Hung-Lun (Fred) Chang is *** See Remarks at APPLIED OPTOELECTRONICS, INC. (AAOI). Chang has reported 22 insider filings with the SEC since 2024. The most recent filing was in July 2026.
| Role | *** See Remarks |
|---|---|
| Notability | 20/100 |
Board memberships
- APPLIED OPTOELECTRONICS, INC.
Reported roles
- *** See Remarks
Trading Pattern
InsiderAlpha's records for Hung-Lun (Fred) Chang go back to 2024: 20 primary Form 4 filings, an average of 6.7 per year. 3 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Career & Filing History
Every role Hung-Lun (Fred) Chang has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- *** See Remarks at APPLIED OPTOELECTRONICS, INC. (AAOI) - 20 filings, 2024 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-07-23 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 616 | $119.26 | $73K |
| 2026-07-23 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 773 | $119.26 | $92K |
| 2026-07-23 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 613 | $119.26 | $73K |
| 2026-07-23 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 2.7K | $119.26 | $319K |
| 2026-06-18 | AAOI | APPLIED OPTOELECTRONICS, INC. | S - Open-market sale [10b5-1] | 40.3K | $170.60 | $6.88M |
| 2026-06-16 | AAOI | APPLIED OPTOELECTRONICS, INC. | S - Open-market sale | 34.0K | $166.53 | $5.66M |
| 2026-06-16 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 27.3K | $172.78 | $4.72M |
| 2026-06-08 | AAOI | APPLIED OPTOELECTRONICS, INC. | S - Open-market sale | 4.0K | $200.07 | $800K |
| 2026-05-19 | AAOI | APPLIED OPTOELECTRONICS, INC. | S - Open-market sale | 33.6K | $173.26 | $5.83M |
| 2026-05-19 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 27.3K | $190.36 | $5.20M |
| 2026-05-19 | AAOI | APPLIED OPTOELECTRONICS, INC. | A - Grant or award | 224.2K | $0.00 | |
| 2026-04-24 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 677 | $150.57 | $102K |
| 2026-04-24 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 850 | $150.57 | $128K |
| 2026-04-24 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 673 | $150.57 | $101K |
| 2026-04-24 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 2.9K | $150.57 | $443K |
| 2026-03-18 | AAOI | APPLIED OPTOELECTRONICS, INC. | S - Open-market sale | 36.4K | $100.25 | $3.65M |
| 2026-02-11 | AAOI | APPLIED OPTOELECTRONICS, INC. | A - Grant or award | 25.8K | $0.00 | |
| 2026-01-27 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 850 | $38.38 | $33K |
| 2026-01-27 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 674 | $38.38 | $26K |
| 2026-01-27 | AAOI | APPLIED OPTOELECTRONICS, INC. | F - Tax withholding / forfeiture | 2.9K | $38.38 | $113K |
Companies - Last 90 Days
- APPLIED OPTOELECTRONICS, INC. (AAOI) - 5 filings, last 2026-07-23
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Hung-Lun (Fred) Chang has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- Chih-Hsiang (Thompson) Lin - $20.47M of AAOI open-market activity in the last 12 months
- Shu-Hua (Joshua) Yeh - $19.68M of AAOI open-market activity in the last 12 months
- Stefan J. Murry - $15.75M of AAOI open-market activity in the last 12 months
- David C. Kuo - $13.19M of AAOI open-market activity in the last 12 months
- Cynthia Delaney - $12.76M of AAOI open-market activity in the last 12 months
- Elizabeth G. Loboa - $9.93M of AAOI open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- IAC Inc.
- Carl C. Icahn
- Infinite Acquisitions Partners LLC
- Ab Investor
- Irrevocable Larson Family Investment Trust
- Jared Isaacman
- Ryan Israel
- Mitchell Jacobson
Frequently Asked Questions
Who is Hung-Lun (Fred) Chang?
Hung-Lun (Fred) Chang is *** See Remarks at APPLIED OPTOELECTRONICS, INC. (AAOI). Chang has reported 22 insider filings with the SEC since 2024. The most recent filing was in July 2026.…
How many SEC Form 4 filings has Hung-Lun (Fred) Chang submitted recently?
5 primary Form 4 filings in the last 90 days, covering 1 company.
Has Hung-Lun (Fred) Chang been buying or selling stock?
Recorded transactions: 0 open-market purchases and 10 open-market sales ($24.69M) across all tracked filings.
Where can I see all of Hung-Lun (Fred) Chang's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Open the live Hung-Lun (Fred) Chang profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.