| 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 |
|---|---|---|---|---|---|---|---|---|---|
President and COO
1 company
Sean Chihhsiang Chen is President and COO at AMBQ. Sean Chihhsiang Chen'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 $4.7M at current prices.
The AMBQ filings lean toward selling, a net 114,692 shares.
Sean Chihhsiang Chen has 7 Form 4 filings on record from October 2025 to October 2026, all as President and COO at Ambiq Micro (AMBQ), 2025–2026.
The 25 reported transactions were 19 open-market sales, 4 option exercises and 2 stock awards.
Counted by filing, the open-market trades come to no purchases and 5 sales worth about $7.4M.
The largest open-market sale was 55,685 shares of AMBQ at an average $70.89 on May 15, 2026, about $3.9M.
4 of the 5 sales since April 2023 were made under a Rule 10b5-1 trading plan; the other was not.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Oct 14, 2026 | AMBQ Ambiq Micro, Inc. | President and COO | Sale+OE10b5-1 | 15,000 | $51.50 | $772,438.22 | -12.4% | - | - | |
| Oct 5, 2026 | AMBQ Ambiq Micro, Inc. | President and COO | Sell10b5-1 | 14,007 | $67.95 | $951,744.27 | -11.6% | - | - | |
| Sep 14, 2026 | AMBQ Ambiq Micro, Inc. | President and COO | Sale+OE10b5-1 | 15,000 | $60.14 | $902,130.10 | -11.1% | - | - | |
| Sep 4, 2026 | AMBQ Ambiq Micro, Inc. | President and COO | Sale+OE10b5-1 | 15,000 | $57.17 | $857,557.59 | -11.1% | - | - | |
| May 15, 2026 | AMBQ Ambiq Micro, Inc. | President and COO | Sale+OE | 55,685 | $70.89 | $3,947,280.94 | -31.6% | - | - |