Form 4: Ambiq Micro CEO Sells Shares
Insider Transaction (Form 4)
Fumihide Esaka, Chief Executive Officer and a Director of Ambiq Micro, Inc., sold 63,500 shares of common stock on September 11, 2026.
Summary
- Option exercise/conversion: acquired 50,000 Common Stock at $12.60 ($630,000) on September 11, 2026; holds 510,460 after (Direct).
- Open-market sale: disposed of 42,083 Common Stock at $63.27 ($2,662,427) on September 11, 2026; holds 468,377 after (Direct).
- Open-market sale: disposed of 7,917 Common Stock at $63.86 ($505,566) on September 11, 2026; holds 460,460 after (Direct).
- Option exercise/conversion: acquired 13,500 Common Stock at $8.12 ($109,620) on September 15, 2026; holds 473,960 after (Direct).
- Open-market sale: disposed of 3,785 Common Stock at $59.56 ($225,444) on September 15, 2026; holds 470,175 after (Direct).
- Open-market sale: disposed of 9,615 Common Stock at $60.55 ($582,171) on September 15, 2026; holds 460,560 after (Direct).
- Open-market sale: disposed of 100 Common Stock at $61.00 ($6,100) on September 15, 2026; holds 460,460 after (Direct).
- Option exercise/conversion: disposed of 19,007 Stock Option (Right to Buy) on September 11, 2026 (Direct).
- Option exercise/conversion: disposed of 30,993 Stock Option (Right to Buy) on September 11, 2026; holds 144,279 after (Direct).
- Option exercise/conversion: disposed of 13,500 Stock Option (Right to Buy) on September 15, 2026; holds 58,507 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $3,981,709 of stock under a pre-arranged Rule 10b5-1 plan, which is typically routine.
Insider Transactions
Fumihide Esaka — Director, Officer (Chief Executive Officer)
Transaction made under a Rule 10b5-1 trading plan.
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-09-11 | Option exercise/conversion | Common Stock | 50,000 | $13 | $630.0K | 510,460 |
| 2026-09-11 | Open-market sale | Common Stock | 42,083 | $63 | $2.7M | 468,377 |
| 2026-09-11 | Open-market sale | Common Stock | 7,917 | $64 | $505.6K | 460,460 |
| 2026-09-15 | Option exercise/conversion | Common Stock | 13,500 | $8 | $109.6K | 473,960 |
| 2026-09-15 | Open-market sale | Common Stock | 3,785 | $60 | $225.4K | 470,175 |
| 2026-09-15 | Open-market sale | Common Stock | 9,615 | $61 | $582.2K | 460,560 |
| 2026-09-15 | Open-market sale | Common Stock | 100 | $61 | $6.1K | 460,460 |
| 2026-09-11 | Option exercise/conversion | Stock Option (Right to Buy) | 19,007 | — | — | 0 |
| 2026-09-11 | Option exercise/conversion | Stock Option (Right to Buy) | 30,993 | — | — | 144,279 |
| 2026-09-15 | Option exercise/conversion | Stock Option (Right to Buy) | 13,500 | — | — | 58,507 |
Key Dates
| Date | Description |
|---|---|
| 2026-09-11 | Option exercise/conversion (50,000 shares) |
| 2026-09-11 | Open-market sale (42,083 shares) |
| 2026-09-11 | Open-market sale (7,917 shares) |
| 2026-09-15 | Option exercise/conversion (13,500 shares) |
| 2026-09-15 | Open-market sale (3,785 shares) |
| 2026-09-15 | Open-market sale (9,615 shares) |
| 2026-09-15 | Open-market sale (100 shares) |
| 2026-09-11 | Option exercise/conversion (19,007 shares) |
| 2026-09-11 | Option exercise/conversion (30,993 shares) |
| 2026-09-15 | Option exercise/conversion (13,500 shares) |
Keywords
insider transaction, Form 4, AMBQ, Ambiq Micro, Inc., bearish, Fumihide Esaka
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