Form 4: Ambiq Micro COO Sells Shares
Insider Transaction (Form 4)
Sean Chihhsiang Chen, President and COO of Ambiq Micro, Inc., sold 14,007 shares of common stock on October 2, 2026.
Summary
- Open-market sale: disposed of 2,492 Common Stock at $69.11 ($172,218) on October 2, 2026; holds 117,783 after (Direct).
- Open-market sale: disposed of 3,008 Common Stock at $69.77 ($209,875) on October 2, 2026; holds 114,775 after (Direct).
- Open-market sale: disposed of 302 Common Stock at $71.86 ($21,701) on October 2, 2026; holds 114,473 after (Direct).
- Open-market sale: disposed of 5,508 Common Stock at $66.38 ($365,625) on October 5, 2026; holds 108,965 after (Direct).
- Open-market sale: disposed of 1,797 Common Stock at $67.29 ($120,913) on October 5, 2026; holds 107,168 after (Direct).
- Open-market sale: disposed of 800 Common Stock at $68.08 ($54,461) on October 5, 2026; holds 106,368 after (Direct).
- Open-market sale: disposed of 100 Common Stock at $69.51 ($6,951) on October 5, 2026; holds 106,268 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $951,744 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 |
|---|---|---|---|---|---|---|
| 2026-10-02 | Open-market sale | Common Stock | 2,492 | $69 | $172.2K | 117,783 |
| 2026-10-02 | Open-market sale | Common Stock | 3,008 | $70 | $209.9K | 114,775 |
| 2026-10-02 | Open-market sale | Common Stock | 302 | $72 | $21.7K | 114,473 |
| 2026-10-05 | Open-market sale | Common Stock | 5,508 | $66 | $365.6K | 108,965 |
| 2026-10-05 | Open-market sale | Common Stock | 1,797 | $67 | $120.9K | 107,168 |
| 2026-10-05 | Open-market sale | Common Stock | 800 | $68 | $54.5K | 106,368 |
| 2026-10-05 | Open-market sale | Common Stock | 100 | $70 | $7.0K | 106,268 |
Key Dates
| Date | Description |
|---|---|
| 2026-10-02 | Open-market sale (2,492 shares) |
| 2026-10-02 | Open-market sale (3,008 shares) |
| 2026-10-02 | Open-market sale (302 shares) |
| 2026-10-05 | Open-market sale (5,508 shares) |
| 2026-10-05 | Open-market sale (1,797 shares) |
| 2026-10-05 | Open-market sale (800 shares) |
| 2026-10-05 | Open-market sale (100 shares) |
Keywords
insider transaction, Form 4, AMBQ, Ambiq Micro, Inc., bearish, Sean Chihhsiang Chen
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