Esaka Fumihide (CIK 2078454) reported 8 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-05-18). Recent activity: Buy AMBQ (60,000 shares), Sell AMBQ (60,000 shares), Buy AMBQ (45,463 shares), Buy AMBQ (14,537 shares), Buy AMBQ (160,616 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-18 | Ambiq Micro, Inc. (AMBQ) | Chief Executive Officer | Buy | 60,000 | $487,200 |
| 2026-05-18 | Ambiq Micro, Inc. (AMBQ) | Chief Executive Officer | Sell | 60,000 | $4.2M |
| 2026-05-18 | Ambiq Micro, Inc. (AMBQ) | Chief Executive Officer | Buy | 45,463 | $369,160 |
| 2026-05-18 | Ambiq Micro, Inc. (AMBQ) | Chief Executive Officer | Buy | 14,537 | $183,166 |
| 2026-04-02 | Ambiq Micro, Inc. (AMBQ) | Chief Executive Officer | Buy | 160,616 | $0 |
| 2026-03-10 | Ambiq Micro, Inc. (AMBQ) | Chief Executive Officer | Buy | 160,616 | $0 |
| 2026-02-10 | Ambiq Micro, Inc. (AMBQ) | Chief Executive Officer | Buy | 53,660 | $315,521 |
| 2025-10-06 | Ambiq Micro, Inc. (AMBQ) | Chief Executive Officer | Buy | 159,907 | $0 |
Source: SEC Form 4 filings · as of 2026-05-18