Ambiq Micro: CEO Esaka Fumihide sold 16,560 shares

What happened

• Esaka Fumihide, CEO, sold a total of 16,560 shares on Oct 2, 2026. The filing lists three sales: 7,113 shares at $69.11 for $491,567; 8,585 shares at $69.77 for $598,994; and 862 shares at $71.86 for $61,943. Total reported proceeds were $1,152,504.

Key details

• Transaction dates and prices:
  • Oct 2, 2026: 7,113 shares, reported price $69.11 (weighted average; range $68.41 to $69.40) — $491,567. (Footnote F2)
  • Oct 2, 2026: 8,585 shares, reported price $69.77 (weighted average; range $69.41 to $70.16) — $598,994. (Footnote F3)
  • Oct 2, 2026: 862 shares, reported price $71.86 (weighted average; range $71.50 to $72.26) — $61,943. (Footnote F4)
• Filing date: Form 4 was filed on Oct 6, 2026; transaction date was Oct 2, 2026.
• Shares owned after the transactions: not stated in the provided filing details.
• Relevant footnotes:
  • F1: sale effected pursuant to issuer policy requiring sell-to-cover to satisfy tax obligations from the vesting and settlement of restricted stock units.
  • F2–F4: reported prices are weighted averages; each footnote gives the price range for the multiple transactions that made up the reported sale and offers to provide full per-price details on request.

Why it may matter

• The filing shows the shares were sold as sell-to-cover to satisfy tax withholding related to restricted stock unit vesting (see footnote F1).
• A filing does not show why the insider traded or why the company acted.