MRCY: Mercury Systems Inc insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 0 sales totaling - in the last 180 days.
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-07-31 | New 13G stake | Vanguard Portfolio Management | 5.13% | SEC | |
| 2026-07-29 | 13G amendment | BlackRock, Inc. | 14.40% | SEC |
Institutional ownership (Q2 2026)
393 institutions reported holding $7.46B of Mercury Systems Inc on Form 13F (357 the quarter before). 82 opened a new position and 44 sold out. Shares held by institutions: +1%.
| Largest holders | Shares | Value |
|---|---|---|
| BlackRock, Inc. | 9,370,902 | $1.15B |
| JANA Partners Management, LP | 3,958,849 | $484.29M |
| STATE STREET CORP | 3,418,290 | $418.05M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3,031,459 | $370.84M |
| Invesco Ltd. | 2,669,450 | $326.55M |
| VANGUARD CAPITAL MANAGEMENT LLC | 2,422,629 | $296.36M |
| FMR LLC | 1,842,103 | $225.34M |
| GOLDMAN SACHS GROUP INC | 1,575,727 | $192.76M |
| Conestoga Capital Advisors, LLC | 1,487,191 | $181.93M |
| GEODE CAPITAL MANAGEMENT, LLC | 1,459,574 | $178.58M |
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