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Updated Jul 16, 2026 · Last SEC filing 2026-06-10
Ambiq Micro, Inc. (AMBQ) has filed 11 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-10. 2 Form 8-K material event filings were reported by AMBQ in the last 90 days. 5 Form 144 notices of proposed sale were filed for AMBQ stock. InsiderAlpha tracks every AMBQ SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SIC classification | Semiconductors & Related Devices (SIC 3674) |
|---|---|
| SEC CIK | 0001500412 |
| Form 4 filings (90d) | 11 |
|---|---|
| Form 8-K filings (90d) | 2 |
| Form 144 notices (90d) | 5 |
| Latest Form 4 filing | 2026-06-10 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Banks Bernard Bennett | Insider | A — Grant or award | 5.0K | $0.00 | — | SEC | |
| TAUTGES JOSEPH A | Insider | A — Grant or award | 5.0K | $0.00 | — | SEC | |
| ZHANG KER | Insider | A — Grant or award | 5.0K | $0.00 | — | SEC | |
| HSIEH Wen Hsuan | Insider | A — Grant or award | 5.0K | $0.00 | — | SEC | |
| Chen Timothy | Insider | A — Grant or award | 5.0K | $0.00 | — | SEC | |
| Winzeler Jeffrey G | Chief Financial Officer | M — Option exercise | 6.0K | $16.80 | $100K | SEC | |
| Chen Timothy | Insider | S — Open-market sale | 3.3K | $81.57 | $266K | SEC | |
| Chen Timothy | Insider | S — Open-market sale | 24.2K | $79.72 | $1.93M | SEC | |
| Chen Timothy | Insider | S — Open-market sale | 20.7K | $80.61 | $1.67M | SEC | |
| Chen Timothy | Insider | S — Open-market sale | 22.4K | $78.85 | $1.77M | SEC | |
| Hanson Scott McLean | Chief Technology Officer | M — Option exercise | 8.1K | $8.12 | $66K | SEC | |
| Chen Sean Chihhsiang | President and COO | S — Open-market sale | 32.4K | $70.53 | $2.28M | SEC | |
| Chen Sean Chihhsiang | President and COO | M — Option exercise | 55.7K | $5.88 | $327K | SEC | |
| Esaka Fumihide | Chief Executive Officer | M — Option exercise | 45.5K | $8.12 | $369K | SEC | |
| Esaka Fumihide | Chief Executive Officer | M — Option exercise | 14.5K | $12.60 | $183K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for Ambiq Micro, Inc. (AMBQ). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Esaka Fumihide | 8 | $5.24M |
| Winzeler Jeffrey G | 8 | $2.45M |
| Hanson Scott McLean | 7 | $855K |
| Chen Timothy | 5 | $5.63M |
| Chen Sean Chihhsiang | 4 | $4.27M |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in AMBQ insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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