Stuart Kupinsky, Executive Vice President, Chief Legal Officer and Corporate Secretary of Mercury Systems Inc, filed an amended statement of changes in beneficial ownership on September 15, 2026, correcting an earlier filing dated August 18, 2026, to add a restricted stock unit grant that had been inadvertently omitted.

Key Highlights

  • Reporting person: Stuart Kupinsky, EVP, CLO and Corporate Secretary of Mercury Systems Inc (NASDAQ:MRCY)
  • RSU grant date: August 17, 2026, with 5,619 restricted stock units acquired at $0 price
  • Vesting schedule: Units vest in equal annual increments over a three-year period following the grant date
  • Direct beneficial ownership after transaction: 65,457 shares of common stock held directly
  • Indirect ownership: 1,233 shares of common stock held indirectly through a 401K Plan
  • Amendment reason: Filed to correct the inadvertent omission of the RSU grant from the original filing

Stuart Kupinsky RSU Award and Corrected Ownership Position at Mercury Systems

Mercury Systems Inc, a provider of processing and sensor systems for defense and intelligence applications, disclosed through this amended filing that its EVP, CLO and Corporate Secretary, Stuart Kupinsky, received a grant of 5,619 restricted stock units on August 17, 2026. According to the filing, the transaction code is recorded as "A" (acquired), and the price per unit is listed as $0, consistent with a standard equity award structure in which no cash consideration is paid at grant.

The filing notes that these restricted stock units "vest in equal annual increments over the three-year period following the grant date," meaning Kupinsky's ownership interest in the underlying shares will be realized in stages rather than immediately. Following the reported transaction, Kupinsky directly holds 65,457 shares of Mercury Systems common stock, with an additional 1,233 shares held indirectly through a 401K Plan, according to the disclosure. The amendment was signed by Douglas Munro as attorney-in-fact on September 15, 2026, with the date of the earliest transaction listed as August 17, 2026, and the original filing dated August 18, 2026.

The filing states the amendment was submitted specifically "to correct the inadvertent omission of the grant of restricted stock units to the reporting person on August 17, 2026," and reflects no other changes to the originally reported ownership data beyond the addition of this grant.

What Was Disclosed

Mercury Systems Inc disclosed an amended beneficial ownership report for EVP Stuart Kupinsky, adding a previously omitted grant of 5,619 restricted stock units from August 17, 2026, vesting equally over three years, bringing his direct share holdings to 65,457 shares.