Fumihide Esaka is CEO at Ambiq Micro, Inc. (AMBQ). They have made 2 open-market trades across 1 company since 2026, most recently 2026-10-15.
CIK 0002078454
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 2 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| AMBQ | 443,900 | $18.4M |
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 | 2026-10-15 | 2026-10-16 | $51.00 | $255K | +7.2% | — | — |
| AMBQ | SELL | 2026-10-02 | 2026-10-06 | $69.60 | $1.2M | -20.0% | — | — |
| AMBQ | SELL · 10b5-1 | 2026-09-11 | 2026-09-15 | $62.70 | $4.0M | +12.3% | -16.5% | — |
| AMBQ | SELL · 10b5-1 | 2026-08-31 | 2026-09-02 | $56.89 | $6.2M | +9.3% | +22.5% | — |
| AMBQ | SELL · 10b5-1 | 2026-08-14 | 2026-08-18 | $64.39 | $869K | -9.2% | -1.0% | — |
| AMBQ | SELL | 2026-05-14 | 2026-05-18 | $70.02 | $4.2M | +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.