AMBQ · Insider Trading
Ambiq Micro, Inc.
Every open-market purchase and sale reported by AMBQ officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-06 | Scott McLean Hanson | Chief Technology Officer | Sell | −8,680 | −$604.09K |
| 2026-10-06 | Fumihide Esaka | Chief Executive Officer | Sell | −16,560 | −$1.15M |
| 2026-10-06 | Sean Chihhsiang Chen | President and COO | Sell | −14,007 | −$951.74K |
| 2026-10-06 | Jeffrey G Winzeler | Chief Financial Officer | Sell | −5,455 | −$379.64K |
| 2026-09-17 | Scott McLean Hanson | Chief Technology Officer | MIXED | — | −$365.10K |
| 2026-09-15 | Ker Zhang | Director | Sell | −10,000 | −$634.36K |
| 2026-09-15 | Fumihide Esaka | Chief Executive Officer | MIXED | — | −$3.24M |
| 2026-09-15 | Sean Chihhsiang Chen | President and COO | MIXED | — | −$780.33K |
| 2026-09-09 | Ker Zhang | Director | MIXED | +1,600 | −$34 |
| 2026-09-09 | Sean Chihhsiang Chen | President and COO | MIXED | — | −$735.76K |
| 2026-09-02 | Fumihide Esaka | Chief Executive Officer | MIXED | +9,271 | −$4.75M |
| 2026-08-28 | Scott McLean Hanson | Chief Technology Officer | MIXED | +10,000 | −$2.76M |
| 2026-08-18 | Scott McLean Hanson | Chief Technology Officer | MIXED | — | −$393.80K |
| 2026-08-18 | Fumihide Esaka | Chief Executive Officer | MIXED | — | −$759.61K |
| 2026-06-10 | Bernard Bennett Banks | Director | A | +4,957 | — |
| 2026-06-10 | Joseph A Tautges | Director | A | +4,957 | — |
| 2026-06-10 | Timothy Chen | Director | A | +4,957 | — |
| 2026-06-10 | Wen Hsuan HSIEH | Director | A | +4,957 | — |
| 2026-06-10 | Ker Zhang | Director | A | +4,957 | — |
| 2026-06-04 | Jeffrey G Winzeler | Chief Financial Officer | M | +5,952 | +$99.99K |
| 2026-05-29 | Timothy Chen | Director | C | +70,592 | — |
| 2026-05-29 | Timothy Chen | Director | Sell | −70,592 | −$5.63M |
| 2026-05-18 | Scott McLean Hanson | Chief Technology Officer | MIXED | +8,100 | −$557.66K |
| 2026-05-18 | Jeffrey G Winzeler | Chief Financial Officer | MIXED | +5,952 | −$1.28M |
| 2026-05-18 | Sean Chihhsiang Chen | President and COO | MIXED | — | −$3.62M |
| 2026-05-18 | Fumihide Esaka | Chief Executive Officer | MIXED | +60,000 | −$3.16M |
| 2026-04-06 | Michele Kim Connors | General Counsel | Sell | −811 | −$21.21K |
| 2026-04-02 | Jeffrey G Winzeler | Chief Financial Officer | A | +41,728 | — |
| 2026-04-02 | Fumihide Esaka | Chief Executive Officer | A | +160,616 | — |
| 2026-04-02 | Scott McLean Hanson | Chief Technology Officer | A | +80,308 | — |
| 2026-04-02 | Sean Chihhsiang Chen | President and COO | A | +64,246 | — |
| 2026-04-02 | Michele Kim Connors | General Counsel | A | +32,123 | — |
| 2026-03-10 | Jeffrey G Winzeler | Chief Financial Officer | A | +41,728 | — |
| 2026-03-10 | Fumihide Esaka | Chief Executive Officer | A | +160,616 | — |
| 2026-03-10 | Scott McLean Hanson | Chief Technology Officer | A | +80,308 | — |
| 2026-03-10 | Michele Kim Connors | General Counsel | A | +32,123 | — |
| 2026-03-10 | Sean Chihhsiang Chen | President and COO | A | +64,246 | — |
| 2026-02-20 | Wen Hsuan HSIEH | Director | M | +238,931 | +$3.01M |
| 2026-02-10 | Fumihide Esaka | Chief Executive Officer | M | +53,660 | +$315.52K |
| 2026-01-28 | Scott McLean Hanson | Chief Technology Officer | Sell | −10,000 | −$310.00K |
| 2026-01-28 | Joseph A Tautges | Director | Sell | −7,800 | −$241.80K |
| 2026-01-07 | Michele Kim Connors | General Counsel | A | +29,242 | — |
| 2025-10-06 | Fumihide Esaka | Chief Executive Officer | A | +159,907 | — |
| 2025-10-06 | Scott McLean Hanson | Chief Financial Officer | A | +83,819 | — |
| 2025-10-06 | Jeffrey G Winzeler | Chief Financial Officer | A | +52,667 | — |
| 2025-10-06 | Sean Chihhsiang Chen | President and COO | A | +56,029 | — |
| 2025-07-31 | Joseph A Tautges | Director | A | +56,546 | — |
| 2025-07-31 | Wen Hsuan HSIEH | Director | C | +394,989 | — |
| 2025-07-31 | Timothy Chen | Director | A | +47,618 | — |
| 2025-07-31 | Ker Zhang | Director | A | +23,809 | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| KPCB XVI Associates, LLC | 10%+ Owner | 1,172,079 | $58.46M |
| Wen Hsuan HSIEH | Director | 638,877 | $31.87M |
| Fumihide Esaka | Chief Executive Officer | 453,347 | $22.61M |
| Scott McLean Hanson | Chief Technology Officer | 217,498 | $10.85M |
| Sean Chihhsiang Chen | President and COO | 108,965 | $5.44M |
| Jeffrey G Winzeler | Chief Financial Officer | 103,956 | $5.19M |
| Timothy Chen | Director | 76,505 | $3.82M |
| Michele Kim Connors | General Counsel | 60,554 | $3.02M |
| Joseph A Tautges | Director | 53,703 | $2.68M |
| Ker Zhang | Director | 20,366 | $1.02M |
| Bernard Bennett Banks | Director | 4,957 | $247.26K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the AMBQ quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.