| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Chief Executive Officer
1 company
Fumihide Esaka is Chief Executive Officer at AMBQ. Fumihide Esaka's net worth is not public. Form 4 filings only show shares in the companies where this person is an insider; those holdings are worth an estimated $19.8M at current prices.
The AMBQ filings lean toward selling, a net 267,060 shares.
Fumihide Esaka has 9 Form 4 filings on record from October 2025 to October 2026, all as Chief Executive Officer at Ambiq Micro (AMBQ), 2025–2026.
The 39 reported transactions were 25 open-market sales, 12 option exercises and 2 stock awards.
Counted by filing, the open-market trades come to no purchases and 6 sales worth about $16.6M.
The largest open-market sale was 108,500 shares of AMBQ at an average $56.89 on September 2, 2026, about $6.2M.
4 of the 6 sales since April 2023 were made under a Rule 10b5-1 trading plan; the other 2 were not.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Oct 15, 2026 | AMBQ Ambiq Micro, Inc. | Chief Executive Officer | Sale+OE10b5-1 | 5,000 | $51.00 | $255,017.48 | -1.1% | - | - | |
| Oct 2, 2026 | AMBQ Ambiq Micro, Inc. | Chief Executive Officer | Sell | 16,560 | $69.60 | $1,152,504.31 | -3.6% | - | - | |
| Sep 15, 2026 | AMBQ Ambiq Micro, Inc. | Chief Executive Officer | Sale+OE10b5-1 | 63,500 | $62.70 | $3,981,708.83 | -12.1% | - | - | |
| Sep 2, 2026 | AMBQ Ambiq Micro, Inc. | Chief Executive Officer | Sale+OE10b5-1 | 108,500 | $56.89 | $6,172,545.56 | -19.1% | - | - | |
| Aug 14, 2026 | AMBQ Ambiq Micro, Inc. | Chief Executive Officer | Sale+OE10b5-1 | 13,500 | $64.39 | $869,226.03 | -2.9% | - | - | |
| May 14, 2026 | AMBQ Ambiq Micro, Inc. | Chief Executive Officer | Sale+OE | 60,000 | $70.02 | $4,201,122.00 | -13.3% | - | - |