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 October 14, 2026.
Summary
- Option exercise/conversion: acquired 15,000 Common Stock at $8.12 ($121,800) on October 14, 2026; holds 121,268 after (Direct).
- Open-market sale: disposed of 7,539 Common Stock at $50.13 ($377,923) on October 14, 2026; holds 113,729 after (Direct).
- Open-market sale: disposed of 1,261 Common Stock at $51.53 ($64,980) on October 14, 2026; holds 112,468 after (Direct).
- Open-market sale: disposed of 2,000 Common Stock at $52.47 ($104,936) on October 14, 2026; holds 110,468 after (Direct).
- Open-market sale: disposed of 4,000 Common Stock at $53.44 ($213,745) on October 14, 2026; holds 106,468 after (Direct).
- Open-market sale: disposed of 200 Common Stock at $54.27 ($10,854) on October 14, 2026; holds 106,268 after (Direct).
- Option exercise/conversion: disposed of 15,000 Stock Option (Right to Buy) on October 14, 2026; holds 119,423 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $772,438 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 |
|---|---|---|---|---|---|---|
| 2026-10-14 | Option exercise/conversion | Common Stock | 15,000 | $8 | $121.8K | 121,268 |
| 2026-10-14 | Open-market sale | Common Stock | 7,539 | $50 | $377.9K | 113,729 |
| 2026-10-14 | Open-market sale | Common Stock | 1,261 | $52 | $65.0K | 112,468 |
| 2026-10-14 | Open-market sale | Common Stock | 2,000 | $52 | $104.9K | 110,468 |
| 2026-10-14 | Open-market sale | Common Stock | 4,000 | $53 | $213.7K | 106,468 |
| 2026-10-14 | Open-market sale | Common Stock | 200 | $54 | $10.9K | 106,268 |
| 2026-10-14 | Option exercise/conversion | Stock Option (Right to Buy) | 15,000 | — | — | 119,423 |
Key Dates
| Date | Description |
|---|---|
| 2026-10-14 | Option exercise/conversion (15,000 shares) |
| 2026-10-14 | Open-market sale (7,539 shares) |
| 2026-10-14 | Open-market sale (1,261 shares) |
| 2026-10-14 | Open-market sale (2,000 shares) |
| 2026-10-14 | Open-market sale (4,000 shares) |
| 2026-10-14 | Open-market sale (200 shares) |
| 2026-10-14 | Option exercise/conversion (15,000 shares) |
Keywords
insider transaction, Form 4, AMBQ, Ambiq Micro, Inc., bearish, Sean Chihhsiang Chen
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