Ambiq Micro CEO Esaka Fumihide Exercises Options, Sells Shares

What Happened

• Esaka Fumihide, CEO of Ambiq Micro (AMBQ), exercised options to acquire 63,500 shares (50,000 on 2026-09-11 at $12.60 each = $630,000; 13,500 on 2026-09-15 at $8.12 each = $109,620) and sold a matching 63,500 shares in open-market transactions across Sept. 11 and Sept. 15, 2026. Sales generated roughly $3.98 million in gross proceeds (multiple trades at weighted-average prices shown below). The filing also reports certain derivative conversions/dispositions shown with $0 proceeds (reported as derivative dispositions).

Key Details

• Transaction dates and prices:
  • Exercises (acquisitions): 50,000 @ $12.60 = $630,000 (9/11/2026); 13,500 @ $8.12 = $109,620 (9/15/2026).
  • Cash sales (open-market, multiple trades): 42,083 @ $63.27 = $2,662,427; 7,917 @ $63.86 = $505,566; 3,785 @ $59.56 = $225,444; 9,615 @ $60.55 = $582,171; 100 @ $61.00 = $6,100 (total sales ≈ $3,981,708).
  • The filing also lists derivative dispositions reported at $0 (19,007; 30,993; and 13,500 shares)—these reflect conversions/settlements of derivative awards.
• Weighted-average sale price ranges (per footnotes): $62.70–$63.70; $63.72–$64.05; $58.95–$59.94; $59.96–$60.80. The filer offered to provide detail on per-trade prices upon request.
• A subset of the trades occurred under a Rule 10b5-1 trading plan adopted by the reporting person (footnote).
• Shares owned after these transactions are not disclosed in the excerpt of the filing provided here.
• Filing date: 2026-09-15 for reportable trades through 2026-09-11 and 9/15; the filing appears timely based on the reported dates.

Context

• These are option exercises (insider paying strike price to acquire shares) followed by immediate or near-immediate open-market sales — a pattern commonly used to cover exercise costs and taxes (i.e., effectively a cashless exercise/partial monetization). The filing shows both the acquisition via exercise (code M) and subsequent sales (code S).
• The presence of a Rule 10b5-1 plan indicates at least some sales were pre-planned according to an established trading program rather than ad-hoc trades.
• The derivative dispositions recorded at $0 are administrative conversions/settlements reported on the Form 4 and do not reflect cash proceeds.

If you want, I can estimate net cash flow (proceeds minus exercise cost and estimated taxes) or check insider ownership history for additional context.