Form 4: Ambiq Micro CEO Sells Shares
Insider Transaction (Form 4)
Fumihide Esaka, Chief Executive Officer and a Director of Ambiq Micro, Inc., sold 5,000 shares of common stock on October 15, 2026.
Summary
- Option exercise/conversion: acquired 5,000 Common Stock at $8.12 ($40,600) on October 15, 2026; holds 448,900 after (Direct).
- Open-market sale: disposed of 500 Common Stock at $49.13 ($24,567) on October 15, 2026; holds 448,400 after (Direct).
- Open-market sale: disposed of 500 Common Stock at $50.02 ($25,011) on October 15, 2026; holds 447,900 after (Direct).
- Open-market sale: disposed of 2,800 Common Stock at $51.15 ($143,214) on October 15, 2026; holds 445,100 after (Direct).
- Open-market sale: disposed of 1,200 Common Stock at $51.85 ($62,226) on October 15, 2026; holds 443,900 after (Direct).
- Option exercise/conversion: disposed of 5,000 Stock Option (Right to Buy) on October 15, 2026; holds 53,507 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $255,017 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 |
|---|---|---|---|---|---|---|
| 2026-10-15 | Option exercise/conversion | Common Stock | 5,000 | $8 | $40.6K | 448,900 |
| 2026-10-15 | Open-market sale | Common Stock | 500 | $49 | $24.6K | 448,400 |
| 2026-10-15 | Open-market sale | Common Stock | 500 | $50 | $25.0K | 447,900 |
| 2026-10-15 | Open-market sale | Common Stock | 2,800 | $51 | $143.2K | 445,100 |
| 2026-10-15 | Open-market sale | Common Stock | 1,200 | $52 | $62.2K | 443,900 |
| 2026-10-15 | Option exercise/conversion | Stock Option (Right to Buy) | 5,000 | — | — | 53,507 |
Key Dates
| Date | Description |
|---|---|
| 2026-10-15 | Option exercise/conversion (5,000 shares) |
| 2026-10-15 | Open-market sale (500 shares) |
| 2026-10-15 | Open-market sale (500 shares) |
| 2026-10-15 | Open-market sale (2,800 shares) |
| 2026-10-15 | Open-market sale (1,200 shares) |
| 2026-10-15 | Option exercise/conversion (5,000 shares) |
Keywords
insider transaction, Form 4, AMBQ, Ambiq Micro, Inc., bearish, Fumihide Esaka
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