Ambiq Micro CEO Esaka Fumihide Exercises Stock Options and Sells Shares Under Rule 10b5-1 Plan

This Form 4 filing reports transactions by Esaka Fumihide, Chief Executive Officer and Director of Ambiq Micro, Inc. (AMBQ), covering the period August 31 to September 2, 2026. All transactions were executed under a Rule 10b5-1 trading plan adopted by the Reporting Person on May 15, 2026. The CEO exercised multiple stock options, acquiring a total of 117,771 shares of common stock at exercise prices of $8.12 and $12.60 per share. Concurrently, he sold approximately 108,500 shares at weighted-average prices ranging from about $56.15 to $58.52 per share, with individual sale price ranges spanning $55.45 to $58.74. Following these exercises and sales, the Reporting Person directly held 460,460 shares of common stock. The corresponding option balances were reduced accordingly across three option grants with expiration dates between 2029 and 2034. The sales reflect routine portfolio diversification by the CEO under a pre-arranged plan and do not indicate any change in company operations or strategy.