Mercury Systems Inc (MRCY)
Who owns Mercury Systems Inc (MRCY)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 92.5% of the shares are freely tradable; institutional investors hold 113.3%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 14.86 | 8,920,325 | +3.6 | 03/31/2026 |
| Vanguard Group Inc | 9.38 | 5,632,049 | -1.7 | 12/31/2025 |
| Jana Partners Management LP | 6.84 | 4,107,424 | -17.2 | 03/31/2026 |
| State Street Corp | 6.44 | 3,865,719 | +12.9 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.85 | 2,910,904 | +0.0 | 03/31/2026 |
| Amvescap Plc. | 4.07 | 2,441,578 | +27.8 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.00 | 2,403,818 | +0.0 | 03/31/2026 |
| Conestoga Capital Advisors, LLC | 3.20 | 1,918,591 | -11.8 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 5.34 | 3,204,141 | +0.0 | 05/29/2026 |
| Vanguard Total Stock Mkt Idx Inv | 2.87 | 1,722,883 | +0.3 | 04/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 16. Jul 2026 | Nearhos Barry R | Director | Other | 170 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.