Ambiq Micro: CEO Esaka exercised 10,000 shares

What happened Esaka Fumihide, CEO, reported exercises and open-market sales on Oct 15, 2026. The filing shows two exercise/conversion (M) transactions totaling 10,000 shares (5,000 shares acquired at $8.12 for $40,600; 5,000 shares disposed as a derivative at $0). The filing also shows open-market sales (S) of 5,000 shares totaling $255,018 (500 shares at $49.13 for $24,567; 500 shares at $50.02 for $25,011; 2,800 shares at $51.15 for $143,214; 1,200 shares at $51.85 for $62,226).

Key details

• Transaction date: Oct 15, 2026. Form filed: Oct 16, 2026.
• Exercise/conversion (M): 5,000 shares acquired at $8.12 ($40,600); 5,000 shares disposed at $0 (derivative).
• Open-market sales (S): 500 shares at $49.13 ($24,567); 500 shares at $50.02 ($25,011); 2,800 shares at $51.15 ($143,214); 1,200 shares at $51.85 ($62,226). Total sale proceeds: $255,018.
• Footnote F1: transactions occurred under a Rule 10b5-1 plan adopted May 15, 2026.
• Footnotes F2–F5: reported sale prices are weighted averages; individual sale prices ranged by transaction group (ranges reported in the filing).
• Footnote F6: option vesting schedule referenced (1/4 vested Feb 21, 2020; thereafter 1/48 monthly).
• Shares owned after the transaction: not provided in the filing excerpt.

Why it may matter

• The filing shows options were exercised and shares were sold on the same date, consistent with a cashless exercise where shares from an exercise are sold contemporaneously.
• The filing does not show why the insider traded or why the company acted.