Mercury Systems (MRCY) CEO William Ballhaus Exercises Options, Sells Shares

What Happened
William L. Ballhaus, Mercury Systems’ Chairman, President & CEO, exercised stock options for a total of 222,152 shares (153,676 on 2026-08-25 and 68,476 on 2026-08-26) at a $43.00 strike (cash paid ≈ $9.55M). On the same dates he sold approximately 160,166 shares in open-market transactions for total gross proceeds of about $14.05M (sales executed across multiple trades and reported at weighted-average prices). The sales were primarily to cover the option exercise price, applicable withholding taxes and transaction costs (sell-to-cover).

Key Details

• Transaction dates: Aug 25–26, 2026. Form 4 filed Aug 27, 2026 (timely).
• Options exercised: 222,152 shares at $43.00 strike; aggregate exercise cost ≈ $9,552,536.
• Shares sold (open market): ~160,166 shares for total proceeds ≈ $14,050,341.
• Net shares retained from this exercise: ~61,986 shares (222,152 exercised − 160,166 sold). (This is the net from these transactions, not total beneficiary holdings reported elsewhere.)
• Footnotes: F1 = options scheduled to expire Aug 17, 2027; F2 = sales solely to cover exercise price, withholding and related costs; F3–F6 = sales executed in multiple trades with reported weighted-average prices (see ranges in filing).
• Transaction types: M = option exercise/acquisition; S = open-market sale; derivative-disposal lines at $0 reflect conversion of option into common stock upon exercise.

Context
This was essentially a cashless/partial cashless exercise: the CEO exercised vested options and sold a portion of the resulting shares to cover the strike and taxes. Exercises reflect conversion of derivatives into shares (acquisition), while the simultaneous sales are routine sell-to-cover activity and do not, by themselves, indicate broader insider sentiment.