Stuart Kupinsky, Executive Vice President, Chief Legal Officer and Corporate Secretary of Mercury Systems Inc, filed a Form 4 on August 18, 2026, reporting the disposition of 6,977 shares of common stock on August 14, 2026.

Key Highlights

  • Reporting person: Stuart Kupinsky, EVP, CLO and Corporate Secretary of Mercury Systems Inc (NASDAQ:MRCY)
  • Transaction date: August 14, 2026
  • Shares disposed: 6,977 shares of common stock at a price of $0, forfeited due to below-target performance
  • Reason for disposition: According to the filing, the shares "were forfeited as a result of below-target performance" under performance stock awards
  • Direct ownership following transaction: 61,033 shares of common stock held directly
  • Indirect ownership: 1,233 shares held indirectly through a 401K Plan

Mercury Systems CLO Reports Performance Award Forfeiture in August 2026

According to the Form 4 filed with the SEC on August 18, 2026, Stuart Kupinsky disclosed a disposition of 6,977 shares of Mercury Systems Inc common stock on August 14, 2026. The transaction was coded "D" (disposed of) and carried a price of $0. The filing explains in its footnote that the shares disposed of "represent shares underlying performance stock awards that were forfeited as a result of below-target performance." No cash proceeds were received, as the forfeiture price is listed as $0.

Following the reported transaction, the filing states that Kupinsky directly holds 61,033 shares of Mercury Systems common stock. In addition, the filing discloses 1,233 shares held indirectly through a 401K Plan. No derivative securities transactions were reported in Table II of the filing.

The Form 4 was signed by Douglas Munro as attorney-in-fact on behalf of Kupinsky and filed on August 18, 2026. Kupinsky's address is listed as 50 Minuteman Road, Andover, Massachusetts 01810, which is also the address of Mercury Systems Inc. The filing covers the earliest transaction date of August 14, 2026, and was filed by one reporting person.

What Was Disclosed

Stuart Kupinsky, EVP, CLO and Corporate Secretary of Mercury Systems Inc (NASDAQ:MRCY), reported the forfeiture of 6,977 performance stock award shares at $0 on August 14, 2026, due to below-target performance, leaving him with 61,033 directly held shares and 1,233 shares in a 401K Plan.