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 14, 2026.
Summary
- Option exercise/conversion: acquired 15,000 Common Stock at $8.12 ($121,800) on September 14, 2026; holds 135,275 after (Direct).
- Open-market sale: disposed of 2,600 Common Stock at $59.36 ($154,346) on September 14, 2026; holds 132,675 after (Direct).
- Open-market sale: disposed of 11,000 Common Stock at $60.24 ($662,618) on September 14, 2026; holds 121,675 after (Direct).
- Open-market sale: disposed of 1,400 Common Stock at $60.83 ($85,166) on September 14, 2026; holds 120,275 after (Direct).
- Option exercise/conversion: disposed of 15,000 Stock Option (Right to Buy) on September 14, 2026; holds 134,423 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $902,130 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 |
|---|---|---|---|---|---|---|
| 2026-09-14 | Option exercise/conversion | Common Stock | 15,000 | $8 | $121.8K | 135,275 |
| 2026-09-14 | Open-market sale | Common Stock | 2,600 | $59 | $154.3K | 132,675 |
| 2026-09-14 | Open-market sale | Common Stock | 11,000 | $60 | $662.6K | 121,675 |
| 2026-09-14 | Open-market sale | Common Stock | 1,400 | $61 | $85.2K | 120,275 |
| 2026-09-14 | Option exercise/conversion | Stock Option (Right to Buy) | 15,000 | — | — | 134,423 |
Key Dates
| Date | Description |
|---|---|
| 2026-09-14 | Option exercise/conversion (15,000 shares) |
| 2026-09-14 | Open-market sale (2,600 shares) |
| 2026-09-14 | Open-market sale (11,000 shares) |
| 2026-09-14 | Open-market sale (1,400 shares) |
| 2026-09-14 | Option exercise/conversion (15,000 shares) |
Keywords
insider transaction, Form 4, AMBQ, Ambiq Micro, Inc., bearish, Sean Chihhsiang Chen
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