Form 4: Ambiq Micro COO Sells Shares
Insider Transaction (Form 4)
Sean Chihhsiang Chen, President and COO of Ambiq Micro, Inc., sold 15,000 shares of common stock on September 4, 2026.
Summary
- Option exercise/conversion: acquired 15,000 Common Stock at $8.12 ($121,800) on September 4, 2026; holds 135,275 after (Direct).
- Open-market sale: disposed of 12,874 Common Stock at $57.09 ($734,933) on September 4, 2026; holds 122,401 after (Direct).
- Open-market sale: disposed of 2,126 Common Stock at $57.68 ($122,625) on September 4, 2026; holds 120,275 after (Direct).
- Option exercise/conversion: disposed of 15,000 Stock Option (Right to Buy) on September 4, 2026; holds 149,423 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $857,558 of stock under a pre-arranged Rule 10b5-1 plan, which is typically routine.
Insider Transactions
Sean Chihhsiang Chen — Officer (President and COO)
Transaction made under a Rule 10b5-1 trading plan.
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-09-04 | Option exercise/conversion | Common Stock | 15,000 | $8 | $121.8K | 135,275 |
| 2026-09-04 | Open-market sale | Common Stock | 12,874 | $57 | $734.9K | 122,401 |
| 2026-09-04 | Open-market sale | Common Stock | 2,126 | $58 | $122.6K | 120,275 |
| 2026-09-04 | Option exercise/conversion | Stock Option (Right to Buy) | 15,000 | — | — | 149,423 |
Key Dates
| Date | Description |
|---|---|
| 2026-09-04 | Option exercise/conversion (15,000 shares) |
| 2026-09-04 | Open-market sale (12,874 shares) |
| 2026-09-04 | Open-market sale (2,126 shares) |
| 2026-09-04 | Option exercise/conversion (15,000 shares) |
Keywords
insider transaction, Form 4, AMBQ, Ambiq Micro, Inc., bearish, Sean Chihhsiang Chen
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