Sean Chihhsiang Chen is President & COO at Ambiq Micro, Inc. (AMBQ). They have made 1 open-market trade across 1 company since 2026, most recently 2026-10-14.
CIK 0002078559
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.
0 open-market purchases, against 1 sale. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| AMBQ | 106,268 | $4.4M |
Shares reported on the most recent Form 4, priced at the 2026-10-16 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| AMBQ | SELL · 10b5-1 | 2026-10-14 | 2026-10-16 | $51.50 | $772K | +7.2% | — | — |
| AMBQ | SELL · 10b5-1 | 2026-10-02 | 2026-10-06 | $67.95 | $952K | -20.0% | — | — |
| AMBQ | SELL · 10b5-1 | 2026-09-14 | 2026-09-15 | $60.14 | $902K | +12.3% | -16.5% | — |
| AMBQ | SELL · 10b5-1 | 2026-09-04 | 2026-09-09 | $57.17 | $858K | +16.1% | -4.1% | — |
| AMBQ | SELL | 2026-05-15 | 2026-05-18 | $70.89 | $3.9M | +14.2% | +13.4% | -3.8% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.