SEC Form 4 · accession 0002078454-26-000014
Ambiq Micro, Inc. · AMBQ
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Fumihide Esaka
Officer — Chief Executive Officer · Director
Period of report
Sep 11, 2026
Accepted (ET)
Sep 15, 2026 · 6:56 pm EDT
Rule 10b5-1 plan
yes — trade under a plan
Issuer CIK
0001500412
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common Stock | Sep 11, 2026 | M | 50,000 | $12.60 | A | 510,460 | D | |
| Common StockF1 | Sep 11, 2026 | S | 42,083 | $63.2661 | D | 468,377 | D | |
| Common StockF2 | Sep 11, 2026 | S | 7,917 | $63.8583 | D | 460,460 | D | |
| Common Stock | Sep 15, 2026 | M | 13,500 | $8.12 | A | 473,960 | D | |
| Common StockF4 | Sep 15, 2026 | S | 3,785 | $59.5626 | D | 470,175 | D | |
| Common StockF5 | Sep 15, 2026 | S | 9,615 | $60.5482 | D | 460,560 | D | |
| Common Stock | Sep 15, 2026 | S | 100 | $61.00 | D | 460,460 | D |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Stock Option (Right to Buy)F6 | $12.60 | Sep 11, 2026 | M | 19,007 | D | — | May 25, 2031 | Common Stock | 19,007 | 0 | D |
| Stock Option (Right to Buy)F7 | $12.60 | Sep 11, 2026 | M | 30,993 | D | — | Jul 20, 2034 | Common Stock | 30,993 | 144,279 | D |
| Stock Option (Right to Buy)F8 | $8.12 | Sep 15, 2026 | M | 13,500 | D | — | Feb 20, 2029 | Common Stock | 13,500 | 58,507 | D |
Explanation of responses
- F1The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $62.70 to $63.70 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- F2The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $63.72 to $64.05 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- F3The transactions occurred under a Rule 10b5-1 plan adopted by the Reporting Person on May 15, 2026.
- F4The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $58.95 to $59.94 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- F5The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $59.96 to $60.80 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- F61/48 of the shares subject to the option vested on June 26, 2021, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's continued service.
- F71/4 of the shares subject to the option vested on January 1, 2024, and 1/48 of the shares subject to the option vest in equal monthly installments thereafter, subject to the Reporting Person's continued service.
- F81/4 of the shares subject to the option vested on February 21, 2020, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's continued service.