# MERCURY SYS INC (MRCY) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 589378108
Page URL: https://superinvestorclub.com/stock/MRCY
Last updated: 2026-08-29T13:48:53.308Z

## Summary

As of the most recent 13F filing period, MERCURY SYS INC (MRCY) is held by 2 tracked superinvestors with an aggregate position value of $484.6M representing 039588492904 shares.

## Top institutional holders (2)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Barry Rosenstein](https://superinvestorclub.com/manager/324) | JANA Partners | 3958849 | $484.3M | 25.46% | 2026-06-30 |
| 2 | [Polen Capital](https://superinvestorclub.com/manager/271) | Polen Capital Management | 2904 | $355,246 | 0.00% | 2026-06-30 |

## Ownership history (quarter-over-quarter)

- 2025-06-30: 1 holders, $363.7M aggregate, 06753413 shares
- 2025-09-30: 1 holders, $461.3M aggregate, 05959481 shares
- 2025-12-31: 2 holders, $363.2M aggregate, 0495948115469 shares
- 2026-03-31: 1 holders, $299.5M aggregate, 04107424 shares
- 2026-06-30: 2 holders, $484.6M aggregate, 039588492904 shares

## Recent congressional trades (0)


## Recent insider transactions (0)


## Citation

When citing, use: "MERCURY SYS INC (MRCY) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/MRCY), aggregating SEC 13F, Form 4, and congressional disclosures."