Home / Auditor changes / APPLIED OPTOELECTRONICS, INC.
Filed 2026-05-08 路 Form 8-K 路 Accession 0001683168-26-003572 large
Price before filing: $157.6 (2026-05-07 close, split/dividend-adjusted)
Market cap at flag: $12.15B (2026-05-08) 路 Latest: $6.16B (2026-10-16)
| Window | AAOI | SPY | vs SPY | |
|---|---|---|---|---|
| 30 days | +24.8% | +1.0% | +23.8% | 2026-06-08 |
| 90 days | -21.2% | +5.3% | -26.5% | 2026-08-06 |
| 180 days | pending | pending | until 2026-11-04 |
Return from the last close before the filing date to the first close on/after the window end. Pending windows have not fully elapsed. Past performance says nothing certain about the future.
90 days before the flag: 9 insiders sold $29.6M (17 sales)
30 days after: 7 insiders sold $47.6M (11 sales)
| Date | Insider | Type | Shares | Price | Value | 10b5-1 plan | Source |
|---|---|---|---|---|---|---|---|
| 2026-02-10 | Kuo David C *** See Remarks | Sale | 2,533 | $50.00 | $127K | yes | Form 4 |
| 2026-02-10 | Murry Stefan J. Chief Financial Officer | Sale | 4,000 | $48.68 | $195K | yes | Form 4 |
| 2026-02-10 | Murry Stefan J. Chief Financial Officer | Sale | 2,327 | $50.00 | $116K | yes | Form 4 |
| 2026-02-11 | Kuo David C *** See Remarks | Sale | 17,467 | $50.17 | $876K | yes | Form 4 |
| 2026-02-11 | Murry Stefan J. Chief Financial Officer | Sale | 11,693 | $50.25 | $588K | yes | Form 4 |
| 2026-02-20 | Murry Stefan J. Chief Financial Officer | Sale | 5,980 | $50.15 | $300K | yes | Form 4 |
| 2026-03-03 | Loboa Elizabeth G Director | Sale | 102,347 | $95.76 | $9.8M | no | Form 4 |
| 2026-03-04 | DeLaney Cynthia Director | Sale | 21,000 | $98.02 | $2.1M | no | Form 4 |
| 2026-03-05 | BLACK RICHARD B Director | Sale | 3,231 | $95.00 | $307K | no | Form 4 |
| 2026-03-06 | Chen Min-Chu (Mike) Director | Sale | 2,500 | $97.00 | $242K | no | Form 4 |
| 2026-03-09 | Chen Min-Chu (Mike) Director | Sale | 8,835 | $108.72 | $961K | no | Form 4 |
| 2026-03-09 | Yeh Shu-Hua (Joshua) *** See Remarks | Sale | 50,000 | $97.10 | $4.9M | yes | Form 4 |
| 2026-03-09 | Yeh William H Director | Sale | 15,000 | $105.76 | $1.6M | no | Form 4 |
| 2026-03-10 | Murry Stefan J. Chief Financial Officer | Sale | 4,000 | $112.76 | $451K | yes | Form 4 |
| 2026-03-16 | Chang Hung-Lun (Fred) *** See Remarks | Sale | 36,400 | $100.25 | $3.6M | no | Form 4 |
| 2026-03-19 | Kuo David C *** See Remarks | Sale | 29,000 | $100.13 | $2.9M | no | Form 4 |
| 2026-04-10 | Murry Stefan J. Chief Financial Officer | Sale | 4,000 | $136.50 | $546K | yes | Form 4 |
| 2026-05-08: red flag filed | |||||||
| 2026-05-11 | Murry Stefan J. Chief Financial Officer | Sale | 4,000 | $159.53 | $638K | yes | Form 4 |
| 2026-05-19 | Chang Hung-Lun (Fred) *** See Remarks | Sale | 33,630 | $173.26 | $5.8M | no | Form 4 |
| 2026-05-19 | Kuo David C *** See Remarks | Sale | 19,227 | $173.26 | $3.3M | no | Form 4 |
| 2026-05-19 | Lin Chih-Hsiang (Thompson) President and CEO, Director | Sale | 58,000 | $173.26 | $10.0M | no | Form 4 |
| 2026-05-19 | Murry Stefan J. Chief Financial Officer | Sale | 33,000 | $173.26 | $5.7M | no | Form 4 |
| 2026-05-19 | Yeh Shu-Hua (Joshua) *** See Remarks | Sale | 39,154 | $173.26 | $6.8M | no | Form 4 |
| 2026-05-26 | DeLaney Cynthia Director | Sale | 56,575 | $189.23 | $10.7M | no | Form 4 |
| 2026-06-02 | Chen Min-Chu (Mike) Director | Sale | 8,247 | $201.00 | $1.7M | no | Form 4 |
Showing 25 of 28 transactions.
Open-market purchases and sales (Form 4 codes P and S) by officers, directors and 10% owners, by transaction date, from 2026-02-07 to 2026-06-07. Excludes option exercises, grants, gifts and tax withholding. Amended filings replace the originals; joint filings count once. Foreign private issuers do not file Form 4. Many insider sales are pre-scheduled (10b5-1 plans) and are not by themselves a sign of wrongdoing.
The company changed its outside auditor (8-K Item 4.01). A dismissal or resignation, especially near an annual report or with reported disagreements, is a warning sign. Changes caused by audit firms merging are usually routine.
Type: changed
Disagreements reported: no
Read the original filing on SEC.gov →
Not investment advice. Automated summary; verify against the filing.
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