MERCURY SYSTEMS INC — Director's Dealing 2025

Oct 24, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MERCURY SYSTEMS INC (MRCY)
CIK: 0001049521
Period of Report: 2025-10-22

Reporting Person: JANA Partners Management, LP (Director, See Remarks)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-10-22	Common Stock, par value $0.01 per share	A	2362	—	Acquired	5966675	Indirect

Footnotes

F1: Represents deferred stock units ("DSUs") that vest on the earlier of the first anniversary of the grant date and the next annual meeting of shareholders. Vested DSUs do not convert into shares of common stock until the date on which Scott Ostfeld ("Mr. Ostfeld"), the Managing Partner of JANA Partners Management, LP ("JANA" or the "Reporting Person") ceases to be a member of the Issuer's board of directors.

F2: Mr. Ostfeld has assigned all rights to any shares issuable pursuant to the grant to the Reporting Person. Pursuant to the assignment, settlement of the award on vesting will be made to the Reporting Person.

F3: JANA 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.