X0508 4 2025-11-06 0 0001049521 MERCURY SYSTEMS INC MRCY 0001998597 JANA Partners Management, LP 888 SEVENTH AVENUE 24TH FLOOR NEW YORK NY 10106 1 0 0 1 See Remarks 0 Common Stock, par value $0.01 per share 2025-11-06 4 S 0 1000000 75.45 D 4966675 I See footnote The transaction reported herein was effected for the purpose of rebalancing the holdings of funds and accounts managed by JANA (as defined below). JANA Partners Management, LP ("JANA" or the "Reporting Person") is a private money management firm which beneficially owns the securities reported herein through various accounts under its management and control. JANA Partners Management GP, LLC (the "GP") is the general partner of JANA. Barry Rosenstein is the Founder of the GP and JANA. JANA, the GP and Barry Rosenstein disclaim any beneficial ownership of any of the Issuer's securities reported herein except to the extent of their pecuniary interest therein, if any. The Reporting Person may be deemed to be a director by deputization for purposes of Section 16 under the Securities Exchange Act of 1934 by virtue of the fact that Scott Ostfeld, a Managing Partner and Portfolio Manager of the Reporting Person, currently serves on the board of directors of the Issuer. /s/ JANA Partners Management, LP, by Jennifer Fanjiang, Partner, Chief Legal Officer and Chief Compliance Officer 2025-11-10