Mike F. Chang is CEO at ALPHA & OMEGA SEMICONDUCTOR Ltd (AOSL). They have made 16 open-market trades across 1 company since 2016, most recently 2026-08-24.
CIK 0001511393
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
6 open-market purchases totalling $3.4M since 2018, against 10 sales. Across 6 scored buys the stock is up 27.0% at ninety days, and 16.5 points ahead of the S&P over the same stretch.
6 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| AOSL | 3,698,839 | $80.3M |
Shares reported on the most recent Form 4, priced at the 2026-09-11 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 67% | 83% | 100% |
| Avg Move | +3.2% | +8.2% | +27.0% |
| Alpha | +3.2% | +6.4% | +16.5% |
| Scored | 6 | 6 | 6 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| AOSL | BUY | 2026-03-09 | 2026-03-10 | $19.00 | $641K | -2.9% | +17.8% | +105.8% |
| AOSL | SELL · 10b5-1 | 2024-01-29 | 2024-01-30 | $26.91 | $807K | -10.3% | -16.3% | -14.1% |
| AOSL | SELL · 10b5-1 | 2023-12-28 | 2023-12-29 | $26.53 | $796K | -0.5% | +3.4% | -17.3% |
| AOSL | SELL · 10b5-1 | 2023-12-14 | 2023-12-18 | $25.00 | $750K | +5.0% | +5.7% | -15.7% |
| AOSL | SELL · 10b5-1 | 2023-10-26 | 2023-10-27 | $25.03 | $751K | -12.1% | -10.3% | +16.0% |
| AOSL | SELL · 10b5-1 | 2023-09-26 | 2023-09-27 | $28.64 | $859K | +0.8% | -16.6% | -8.1% |
| AOSL | SELL · 10b5-1 | 2023-09-01 | 2023-09-05 | $31.01 | $930K | -6.1% | -7.8% | -29.3% |
| AOSL | SELL | 2023-01-09 | 2023-01-10 | $29.96 | $1.7M | +10.4% | +0.6% | -14.7% |
| AOSL | SELL | 2022-03-17 | 2022-03-17 | $55.00 | $3.1M | +17.2% | -17.8% | -36.6% |
| AOSL | SELL | 2021-01-11 | 2021-01-12 | $28.70 | $730K | +0.5% | +26.5% | +6.4% |
| AOSL | SELL | 2021-01-06 | 2021-01-08 | $28.15 | $7.0M | +15.5% | +29.7% | +31.2% |
| AOSL | SELL | 2020-10-05 | 2020-10-06 | $15.50 | $1.5M | +6.8% | +9.4% | +54.0% |
| AOSL | BUY | 2019-01-03 | 2019-01-04 | $9.99 | $5K | -0.8% | +16.1% | +17.8% |
| AOSL | BUY | 2018-12-24 | 2018-12-27 | $9.84 | $624K | +6.4% | +18.6% | +9.1% |
| AOSL | BUY | 2018-12-20 | 2018-12-21 | $9.86 | $532K | +7.6% | +6.5% | +13.7% |
| AOSL | BUY | 2018-12-17 | 2018-12-19 | $9.96 | $802K | +6.4% | +6.2% | +12.0% |
| AOSL | BUY | 2018-12-11 | 2018-12-13 | $10.00 | $8K | +0.2% | +2.1% | +10.2% |
| AOSL | BUY | 2018-12-06 | 2018-12-10 | $9.93 | $703K | -0.6% | +4.6% | +9.8% |
| AOSL | BUY | 2018-11-20 | 2018-11-21 | $10.00 | $39K | +2.4% | -4.3% | +11.6% |
| AOSL | SELL | 2016-12-13 | 2016-12-14 | $22.10 | $533K | +3.7% | +5.5% | -21.0% |
| AOSL | SELL | 2016-12-12 | 2016-12-14 | $22.15 | $2.2M | +3.7% | +5.5% | -21.0% |
| AOSL | SELL | 2016-12-12 | 2016-12-14 | $22.19 | $574K | +3.7% | +5.5% | -21.0% |
| AOSL | SELL | 2016-11-11 | 2016-11-15 | $21.00 | $1.1M | +11.5% | +5.9% | +0.3% |
| AOSL | SELL | 2016-10-10 | 2016-10-12 | $22.64 | $1.1M | -0.4% | -4.3% | -2.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.