🕵️ Ambiq Micro, Inc. ($AMBQ)
SEC insider & ownership activity, last 12 months · CIK 1500412 · every row links its SEC filing
Over the last 12 months insiders sold $34.0M with no open-market buying against it. Fumihide Esaka sold $15.2M (May–Sep). 3 planned sales are pending, the largest $2.8M (Fumihide (HUMI) Esaka). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 8 sellers, $34.0M (47 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Fumihide Esaka | 0 | – | 18 | $15.2M | Sep 15, 2026 |
| Sean Chen | 0 | – | 7 | $5.7M | Sep 14, 2026 |
| Chen Timothy | 0 | – | 4 | $5.6M | May 27, 2026 |
| Scott Hanson | 0 | – | 10 | $4.7M | Aug 27, 2026 |
| Jeffrey G. Winzeler | 0 | – | 2 | $1.8M | May 14, 2026 |
| Zhang Ker | 0 | – | 3 | $645K | Sep 11, 2026 |
| Joseph A. Tautges | 0 | – | 1 | $242K | Jan 26, 2026 |
| Connors Michele Kim | 0 | – | 2 | $21K | Apr 2, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| KPCB XVI Associates, LLC | 8.2% | 13G | Nov 3, 2025 | filing ↗ | |
| Kleiner Perkins Caufield & Byers XVI, LLC | 7.9% | 13G | Nov 3, 2025 | filing ↗ | |
| BlackRock, Inc. | 5.3% | 13G | Jul 27, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Ker Zhang | $634K | Sep 11, 2026 | filing ↗ |
| Fumihide Esaka | $3.2M | Sep 11, 2026 | filing ↗ |
| Sean Chen | $1.7M | Sep 4, 2026 | filing ↗ |
| Ker Zhang | $11K | Sep 4, 2026 | filing ↗ |
| Fumihide (HUMI) Esaka | $625K | Sep 2, 2026 | filing ↗ |
| Fumihide (HUMI) Esaka | $2.8M | Sep 1, 2026 | filing ↗ |
| Fumihide (HUMI) Esaka | $2.0M | Aug 31, 2026 | filing ↗ |
| Scott Hanson | $1.6M | Aug 27, 2026 | filing ↗ |
| Scott Hanson | $1.6M | Aug 26, 2026 | filing ↗ |
| Scott Hanson | $1.4M | Aug 14, 2026 | filing ↗ |
| Fumihide Esaka | $2.9M | Aug 14, 2026 | filing ↗ |
| Triumph WAY Investment Inc | $5.6M | May 27, 2026 | filing ↗ |
| Sean Chen | $3.9M | May 15, 2026 | filing ↗ |
| Jeff G. Winzeler | $1.8M | May 14, 2026 | filing ↗ |
| Scott Hanson | $706K | May 14, 2026 | filing ↗ |
| Fumihide Esaka | $4.2M | May 14, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Aug 11, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 11, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jul 30, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 30, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 8, 2026 | filing ↗ |
| Earnings (2.02) | May 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 12, 2026 | filing ↗ |
| Earnings (2.02) | Mar 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 5, 2026 | filing ↗ |
| Earnings (2.02) | Jan 21, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jan 5, 2026 | filing ↗ |
| Earnings (2.02) | Nov 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 6, 2025 | filing ↗ |
| Officer/director changes (5.02) | Sep 29, 2025 | filing ↗ |