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The Vanguard Group filed an amendment on Schedule 13G/A disclosing it beneficially owns 0 shares of Mercury Systems Inc Common Stock, representing 0% of the class. The filing notes an internal realignment effective January 12, 2026, after which certain subsidiaries report ownership separately.
Ratner Steven reported acquisition or exercise transactions in this Form 4 filing.
Mercury Systems EVP and CHRO Steven Ratner received 437 shares of common stock on March 16, 2026 as a grant of restricted stock units earned as matching awards under Mercury's Deferred Compensation Matching Plan. Following this award, he holds 34,238 shares directly and 235 shares indirectly through a 401(k) plan.
JANA Partners Management filed Amendment No. 4 to its Schedule 13D on Mercury Systems Inc., updating its ownership disclosure. Based on 60,014,632 common shares outstanding as of January 31, 2026, JANA reports beneficial ownership of 4,114,618 shares, or about 6.9% of the company.
The position includes deferred stock units granted to Board member Mr. Ostfeld: 4,832 DSUs from October 23, 2024 and 2,362 DSUs from October 22, 2025. These DSUs vest on the earlier of one year after grant or the next annual shareholder meeting and convert into shares when he leaves the Board, with all rights to the underlying shares assigned to JANA. JANA has sole voting and dispositive power over the reported shares, exercised by its principal, and recent transactions were executed in the open market through brokerage firms.
MERCURY SYSTEMS INC shareholder JANA Partners Management, LP reported open-market sales of a total of 452,057 shares of Mercury common stock over three days. The sales occurred on March 2, 3, and 4, 2026 at weighted average prices of about $94.05, $90.12, and $89.68 per share, respectively. After these transactions, accounts managed by JANA held 4,114,618 shares of Mercury common stock. JANA states the sales were made to rebalance the holdings of the funds and accounts it manages and disclaims beneficial ownership beyond its pecuniary interest.
Mercury Systems director Howard L. Lance sold common stock in the company. On February 25, 2026, he completed an open-market sale of 4,832 shares of Mercury Systems common stock at a weighted average price of $88.9817 per share, executed across multiple trades.
After this sale, Lance directly owned 27,272 common shares. In addition, 9,250 shares were held indirectly through The Howard L. Lance Revocable Living Trust dated September 1, 2006.
Mercury Systems executive Stuart Kupinsky reported an insider stock sale mainly tied to taxes. As EVP, CLO & Corporate Secretary, he sold 2,287 shares of Mercury Systems common stock in an open-market transaction at an average price of $83.5554 per share.
According to the footnotes, these shares were sold under a sell-to-cover program to satisfy tax withholding obligations upon vesting of stock awards, indicating the sale was driven by tax requirements rather than a discretionary portfolio decision. After this transaction, Kupinsky held 68,010 shares directly and 1,082 shares indirectly through a 401(k) plan.
Mercury Systems Inc. senior vice president and chief accounting officer Douglas Munro reported an open-market sale of 582 shares of common stock on February 17, 2026. The shares were sold at a price of $83.5554 per share as part of a sell-to-cover program to satisfy tax withholding obligations upon the vesting of stock awards.
After this transaction, Munro directly held 14,328 shares of Mercury Systems common stock and indirectly held 248 shares through a 401(k) plan. The filing indicates this was a tax-related sale rather than a discretionary reduction of his overall economic interest.
A holder of Mercury Systems (MRCY) stock filed a notice of intent to sell 2,287 shares of common stock through Fidelity Brokerage Services on NASDAQ, with an approximate sale date of February 17, 2026 and an aggregate market value of $191,091.20.
The shares were acquired on February 13, 2026 through restricted stock vesting from the issuer as compensation. The form states that the person does not know of any undisclosed material adverse information about the issuer’s operations.
Mercury Systems had a shareholder file a Form 144 notice to sell 582 shares of its common stock through Fidelity Brokerage Services on 02/17/2026, to be traded on NASDAQ. The filing lists an aggregate market value of 48629.25 for these shares, compared with 60014632 common shares outstanding.
The securities were acquired on 02/13/2026 via restricted stock vesting from the issuer as compensation, and the same date is shown as the payment date. The signer represents they are not aware of any undisclosed material adverse information about Mercury Systems.