SEC Form 4 · accession 0001049521-26-000060
MERCURY SYSTEMS INC · MRCY
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
William L Ballhaus
Officer — Chairman, President & CEO · Director
Period of report
Aug 21, 2026
Accepted (ET)
Aug 25, 2026 · 5:53 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001049521
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF1 | Aug 21, 2026 | M | 92,850 | $42.00 | A | 321,047 | D | |
| Common StockF2,F3 | Aug 21, 2026 | S | 64,796 | $92.404 | D | 256,251 | D | |
| Common StockF2,F4 | Aug 21, 2026 | S | 204 | $93.508 | D | 256,047 | D | |
| Common StockF1 | Aug 24, 2026 | M | 140,650 | $42.00 | A | 396,697 | D | |
| Common StockF1 | Aug 24, 2026 | M | 11,348 | $43.00 | A | 408,045 | D | |
| Common StockF2,F5 | Aug 24, 2026 | S | 105,471 | $89.473 | D | 302,574 | D | |
| Common StockF2,F6 | Aug 24, 2026 | S | 2,738 | $90.60 | D | 299,836 | D | |
| Common Stock | holding | — | — | — | 1,403 | I | 401K Plan | |
| Common Stock | holding | — | — | — | 7,066 | I | By Milestone Road Holdings, LLC |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Employee Stock Option (Right to Buy)F1 | $42.00 | Aug 21, 2026 | M | 92,850 | D | Aug 17, 2026 | Aug 17, 2027 | Common Stock | 92,850 | 140,650 | D |
| Employee Stock Option (Right to Buy)F1 | $42.00 | Aug 24, 2026 | M | 140,650 | D | Aug 17, 2026 | Aug 17, 2027 | Common Stock | 140,650 | 0 | D |
| Employee Stock Option (Right to Buy)F1 | $43.00 | Aug 24, 2026 | M | 11,348 | D | Aug 17, 2026 | Aug 17, 2027 | Common Stock | 11,348 | 222,152 | D |
Explanation of responses
- F1Represents the exercise of a stock option award scheduled to expire on August 17, 2027.
- F2Represents the sale of shares intended solely to cover the exercise price, applicable withholding taxes and related transaction costs of stock options exercised on the same date.
- F3This transaction was executed in multiple trades at prices ranging from $92.300 to $92.910. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
- F4This transaction was executed in multiple trades at prices ranging from $93.505 to $93.680. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
- F5This transaction was executed in multiple trades at prices ranging from $89.170 to $90.150. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
- F6This transaction was executed in multiple trades at prices ranging from $90.250 to $90.735. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.