Ambiq Micro: president and COO Chen Sean Chihhsiang sold 14,007 shares

What happened

• Chen Sean Chihhsiang, president and COO, sold a total of 14,007 shares in open-market transactions. The filing lists seven dispositions: 2,492 shares at $69.11 for $172,218; 3,008 shares at $69.77 for $209,875; 302 shares at $71.86 for $21,701; 5,508 shares at $66.38 for $365,625; 1,797 shares at $67.29 for $120,913; 800 shares at $68.08 for $54,461; and 100 shares at $69.51 for $6,951. Total proceeds reported: $951,744.

Key details

• Transaction dates and reported prices: Oct 2, 2026 (sales at reported prices $69.11, $69.77, $71.86) and Oct 5, 2026 (sales at reported prices $66.38, $67.29, $68.08, $69.51).
• Filing date and period: Form 4 filed Oct 6, 2026; period of report Oct 2, 2026.
• Shares owned after the transaction: not specified in the provided filing excerpt.
• Relevant footnotes from the filing:
  • Sale effected pursuant to the issuer's sell-to-cover policy to satisfy tax obligations on vesting/settlement of restricted stock units (footnote F1).
  • Transactions occurred under a Rule 10b5-1 plan adopted by the reporting person on Jun 5, 2026 (footnote F5).
  • Several reported prices are weighted average sale prices; the filing gives price ranges and states the reporting person will provide a breakdown on request (footnotes F2–F4, F6–F8).

Why it may matter

• These were market sales reported as open-market dispositions; the filing does not indicate an option exercise, a gift, or a nonmarket transfer.
• The reporting person is an executive (president and COO); the filing does not state 10% owner status.
• A filing does not show why the insider traded or why the company acted.