MRCY Mercury Systems, Inc.
Mercury Systems, Inc. (MRCY) Hedge Fund Activity
This view isolates hedge funds from the broader institutional ownership shown on the Institutional tab. A pension fund tracking an index may have no view on a stock; when a hedge fund builds or exits a position, that decision can carry information. This page measures those changes. Positions as of June 30, 2026.
Based on quarterly 13F long-equity filings. Changes compare reported quarter-end positions; filings can be reported up to 45 days later and do not represent a fund's complete exposure.
Most significant moves
Ranked by conviction, not size — how much of the fund's own book the position represents, how far it moved, and what kind of fund made it.
| Fund | Action | Shares changed | Change | Est. value | Portfolio wt. | Score |
|---|---|---|---|---|---|---|
| CITADEL ADVISORS LLC Quant | Sold Out | -292.9K | -100.0% | $35.8M | 0.0% | 62 |
| Qube Research & Technologies Ltd Quant | Sold Out | -111.2K | -100.0% | $13.6M | 0.0% | 59 |
| Squarepoint Ops LLC Quant | Sold Out | -21.6K | -100.0% | $2.6M | 0.0% | 56 |
| Select Equity Group Long/Short Growth | Increased | +81.8K | +98.0% | $10.0M | 0.1% | 56 |
| Magnetar Capital Event Quant | New | +1.8K | — | $226.1K | 0.0% | 54 |
| ExodusPoint Capital Management Long/Short Quant | Sold Out | -39.2K | -100.0% | $4.8M | 0.0% | 54 |
| Weiss Asset Management Event Quant | New | +7.1K | — | $862.7K | 0.0% | 54 |
| Capstone Investment Advisors Quant Macro | Sold Out | -4.5K | -100.0% | $552.4K | 0.0% | 53 |
| Trexquant Investment Quant | New | +17.7K | — | $2.2M | 0.0% | 53 |
| Graham Capital Management Quant Macro | New | +9.8K | — | $1.2M | 0.0% | 51 |
Most significant buyers
By move score, not size.
- Select Equity Group
- Magnetar Capital
- Weiss Asset Management
- Trexquant Investment
- Graham Capital Management
Most significant sellers
By move score, not size.
- CITADEL ADVISORS LLC
- Qube Research & Technologies Ltd
- Squarepoint Ops LLC
- ExodusPoint Capital Management
- Capstone Investment Advisors
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| CITADEL ADVISORS LLC | 1 | 0 | 292.9K | -292.9K | -100.0% | 0.0% | Sold Out | 62 |
| Qube Research & Technologies Ltd | 2 | 0 | 111.2K | -111.2K | -100.0% | 0.0% | Sold Out | 59 |
| Squarepoint Ops LLC | 2 | 0 | 21.6K | -21.6K | -100.0% | 0.0% | Sold Out | 56 |
| Select Equity Group | 1 | 165.3K | 83.5K | +81.8K | +98.0% | 0.1% | Increased | 56 |
| Magnetar Capital | 2 | 1.8K | 0 | +1.8K | — | 0.0% | New | 54 |
| ExodusPoint Capital Management | 3 | 0 | 39.2K | -39.2K | -100.0% | 0.0% | Sold Out | 54 |
| Weiss Asset Management | 2 | 7.1K | 0 | +7.1K | — | 0.0% | New | 54 |
| Capstone Investment Advisors | 3 | 0 | 4.5K | -4.5K | -100.0% | 0.0% | Sold Out | 53 |
| Trexquant Investment | 3 | 17.7K | 0 | +17.7K | — | 0.0% | New | 53 |
| Graham Capital Management | 3 | 9.8K | 0 | +9.8K | — | 0.0% | New | 51 |
| Brevan Howard Capital Management | 3 | 8.7K | 0 | +8.7K | — | 0.0% | New | 51 |
| Cinctive Capital Management | 3 | 0 | 6.6K | -6.6K | -100.0% | 0.0% | Sold Out | 50 |
| MILLENNIUM MANAGEMENT LLC | 2 | 2.9K | 16.0K | -13.1K | -81.9% | 0.0% | Reduced | 49 |
| Winton Group | 4 | 0 | 3.1K | -3.1K | -100.0% | 0.0% | Sold Out | 48 |
| Y-Intercept | 4 | 0 | 3.2K | -3.2K | -100.0% | 0.0% | Sold Out | 48 |
| Engineers Gate | 4 | 0 | 3.0K | -3.0K | -100.0% | 0.0% | Sold Out | 48 |
| Quantbot Technologies | 4 | 670 | 0 | +670 | — | 0.0% | New | 45 |
| TWO SIGMA INVESTMENTS, LP | 2 | 71.9K | 162.1K | -90.2K | -55.7% | 0.0% | Reduced | 44 |
| Edgestream Partners | 4 | 37.1K | 88.2K | -51.1K | -58.0% | 0.1% | Reduced | 35 |
| Walleye Capital | 3 | 1.1K | 2.2K | -1.1K | -48.9% | 0.0% | Reduced | 32 |
| D. E. Shaw & Co., Inc. | 1 | 61.8K | 54.9K | +6.9K | +12.6% | 0.0% | Increased | 30 |
| Man Group | 3 | 110.6K | 144.7K | -34.1K | -23.6% | 0.0% | Reduced | 29 |
| AQR Capital Management | 3 | 55.2K | 67.3K | -12.1K | -18.0% | 0.0% | Reduced | 26 |
| Gotham Asset Management, LLC | 2 | 6.8K | 6.8K | +13 | +0.2% | 0.0% | Increased | 23 |
Every fund above opens. Subscribers can see any manager's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeHedge funds are identified from their 13F filings, which are due 45 days after quarter end and cover long U.S.-listed equity positions only. A fund's short book never appears, so a reduced position can mean a changed view or a changed hedge — the filing doesn't say which.