Chen Sean Chihhsiang Insider Trading -- Recent SEC Form 4 Transactions
Chen Sean Chihhsiang (CIK 2078559) reported 20 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-10-06). Recent activity: Sell AMBQ (302 shares), Sell AMBQ (5,508 shares), Sell AMBQ (1,797 shares), Sell AMBQ (800 shares), Sell AMBQ (100 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-06 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 302 | $21,701 |
| 2026-10-06 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 5,508 | $365,625 |
| 2026-10-06 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 1,797 | $120,913 |
| 2026-10-06 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 800 | $54,461 |
| 2026-10-06 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 100 | $6,951 |
| 2026-10-06 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 2,492 | $172,218 |
| 2026-10-06 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 3,008 | $209,875 |
| 2026-09-15 | Ambiq Micro, Inc. (AMBQ) | President and COO | Buy | 15,000 | $121,800 |
| 2026-09-15 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 2,600 | $154,346 |
| 2026-09-15 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 11,000 | $662,618 |
| 2026-09-15 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 1,400 | $85,166 |
| 2026-09-09 | Ambiq Micro, Inc. (AMBQ) | President and COO | Buy | 15,000 | $121,800 |
| 2026-09-09 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 12,874 | $734,933 |
| 2026-09-09 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 2,126 | $122,625 |
| 2026-05-18 | Ambiq Micro, Inc. (AMBQ) | President and COO | Buy | 55,685 | $327,428 |
| 2026-05-18 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 32,351 | $2.3M |
| 2026-05-18 | Ambiq Micro, Inc. (AMBQ) | President and COO | Sell | 23,334 | $1.7M |
| 2026-04-02 | Ambiq Micro, Inc. (AMBQ) | President and COO | Buy | 64,246 | $0 |
| 2026-03-10 | Ambiq Micro, Inc. (AMBQ) | President and COO | Buy | 64,246 | $0 |
| 2025-10-06 | Ambiq Micro, Inc. (AMBQ) | President and COO | Buy | 56,029 | $0 |
Source: SEC Form 4 filings · as of 2026-10-06