Mercury Systems, Inc. (MRCY) ownership: Top institutional holder: BlackRock, Inc. ($650.38M). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 8920325.00 | $650.38M | 2026-03-31 |
| VANGUARD GROUP INC | 5632049.00 | $411.20M | 2025-12-31 |
| JANA Partners Management, LP | 4107424.00 | $299.47M | 2026-03-31 |
| STATE STREET CORP | 3865719.00 | $281.85M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 2910904.00 | $212.23M | 2026-03-31 |
| Invesco Ltd. | 2441578.00 | $178.02M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2403818.00 | $175.26M | 2026-03-31 |
| Conestoga Capital Advisors, LLC | 1918591.00 | $139.88M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-08-17 | |
| Sell | null | 2026-08-17 | |
| Sell | null | 2026-08-17 | |
| Sell | null | 2026-08-17 | |
| Sell | null | 2026-08-17 | |
| Sell | null | 2026-08-17 | |
| Sell | null | 2026-08-17 | |
| Sell | null | 2026-08-17 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.