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# JANA Seeks Antitrust Early Termination For Mercury, Separates Request From Any Board Dispute
- URL: https://www.bullished.co/jana-seeks-antitrust-early-termination-for-mercury-separates-request-from-any-board-c6dea995/
- Published: 2026-11-11T02:16:40.000Z
- Updated: 2026-11-11T02:16:40.000Z
- Description: The investor reported approximately 6.4% beneficial ownership and said its existing antitrust clearance was nearing expiration.
- Author: Matteo Parrino
- Tags: SEC Filings, MRCY, Industry: Technology, Topic: Ownership & Activism

JANA Partners Management requested [early termination](https://www.sec.gov/Archives/edgar/data/0001998597/000090266426004458/xslSCHEDULE%5F13D%5FX01/primary%5Fdoc.xml?ref=bullished.co) under federal antitrust law Tuesday because its existing clearance for [Mercury Systems](https://www.bullished.co/tag/mrcy/), which makes processing electronics for aerospace and defense, was nearing expiration. In an amended SEC ownership disclosure, JANA said the request was unrelated to disagreements with Mercury, its management or its board over operations, policies or practices.

## A 6.4% Position, No Recent Trades

JANA reported [3,880,671 shares](https://www.sec.gov/Archives/edgar/data/0001998597/000090266426004458/xslSCHEDULE%5F13D%5FX01/primary%5Fdoc.xml?ref=bullished.co) on the beneficial-ownership basis used by the SEC, representing approximately 6.4% of the common stock. That percentage uses Mercury's reported 60,863,586 shares outstanding as of September 1, 2026.

Funds managed by JANA hold the investment. The reported aggregate purchase cost was approximately $118 million—a measure of money invested, rather than the position's current market value. JANA reported no Mercury share transactions during the past 60 days.

The request falls under the Hart-Scott-Rodino Antitrust Improvements Act of 1976\. JANA's investment predates that request: its original SEC ownership disclosure was filed on September 22, 2022.

## Board Awards Count Toward Ownership

The reported position includes 9,542 deferred stock units—awards that become shares—granted to board member Mr. Ostfeld for his service. He assigned JANA the rights to shares issued under those awards.

Of those units, 7,194 have vested. Another 2,348 were granted Wednesday, October 28, 2026, and are scheduled to vest on whichever comes first: the grant's first anniversary or Mercury's next annual shareholder meeting.

Vesting alone does not turn the units into shares. Conversion occurs when Ostfeld leaves the board, linking part of JANA's reported ownership to his board service.

## Electronics For Defense And Aerospace

Mercury supplies components, modules and integrated subsystems used to process signals and data in radar, sensors, electronic warfare, avionics and weapons. Its customers include U.S. and European defense prime contractors, the U.S. government and commercial aerospace equipment makers.

The Andover, Massachusetts-based company reported fiscal 2026 revenue of $983.6 million. It operates Signal Technologies, Processing Technologies, Integrated Processing Solutions and a Europe, Middle East and Africa unit.

JANA's stated reason for the antitrust request was the approaching expiration of clearance; its reported investment remained approximately 6.4% on the SEC beneficial-ownership basis.

Learn

- [13D Filing Requirements And Deadline, Shown With Real Filings →](https://www.bullished.co/learn/13d-filing-requirements/)  
A Schedule 13D is required when you own more than 5% of a public company's voting shares. See the deadline, contents and real filings from this week.
- [13D Vs 13G: What Each 5% Stake Filing Means And How To Read One →](https://www.bullished.co/learn/13d-vs-13g/)  
13D vs 13G: both report stakes above 5%, but 13G is the short passive form and 13D explains intent. See real BlackRock and Pictet filings read in plain English.

### Sources

- [SCHEDULE 13D/A — JANA Partners Management, LP re: MERCURY SYSTEMS INC (MRCY)](https://www.sec.gov/Archives/edgar/data/0001998597/000090266426004458/xslSCHEDULE%5F13D%5FX01/primary%5Fdoc.xml?ref=bullished.co) — SEC EDGAR

### More on Mercury Systems

- [Mercury Systems CEO Says Earlier Buying Delays Held Up Deliveries — Its Factories Have Room](https://www.bullished.co/mercury-systems-ceo-says-earlier-buying-delays-held-up-deliveries-its-factories-have-room-9c82e9a9/)
- [Mercury Systems Orders Soar 48% As It Raises Its Annual Sales Outlook](https://www.bullished.co/mercury-systems-orders-soar-48-as-it-raises-its-annual-sales-outlook-c304d51e/)
- [Mercury Systems Stock Plunges 10%, Erasing $491 Million, A Day After Board Shuffle](https://www.bullished.co/mercury-systems-stock-plunges-10-erasing-491-million-a-day-after-board-shuffle-1adb4acf/)

[All Mercury Systems (MRCY) coverage →](https://www.bullished.co/tag/mrcy/)