Ambiq Micro (AMBQ) CEO Esaka Exercises Options, Sells Shares

What Happened

• Ambiq Micro CEO Fumihide Esaka exercised 13,500 option shares at $8.12 per share (cost $109,620) on August 14, 2026, and sold a total of 13,500 shares in open-market transactions the same day for combined gross proceeds of approximately $869,226. The sales were executed in multiple tranches at weighted-average prices reported as $63.29, $64.40 and $65.26 per share.

Key Details

• Transaction date: August 14, 2026; Form 4 filed August 18, 2026 (timely filing).
• Exercise: 13,500 shares acquired at $8.12 each (total cash paid $109,620).
• Sales: 1,282 shares @ weighted avg $63.29 (range $62.66–$63.64); 10,718 shares @ weighted avg $64.40 (range $63.71–$64.70); 1,500 shares @ weighted avg $65.26 (range $64.92–$65.56). Total gross sale proceeds ≈ $869,226.
• A separate derivative line reports 13,500 shares disposed at $0.00 (related to the option exercise mechanics).
• Shares owned after the transactions are not stated in the information provided.
• Notable footnotes: Sales were made under a Rule 10b5-1 trading plan adopted May 15, 2026 (F1). Weighted-average sale prices reflect multiple execution prices; detailed breakdowns are available on request (F2–F4). Vesting history of the option is noted (F5).

Context

• The matching number of shares exercised (13,500) and shares sold (13,500) is consistent with an immediate disposition or cashless exercise arrangement (exercise followed by same-day sale), a common way insiders cover exercise costs and taxes. The transactions were executed under a pre-established 10b5-1 plan, which allows scheduled trades. These are routine insider transactions and do not, by themselves, indicate the insider’s longer-term view.