MKSI MKS Inc.
MKS Inc. (MKSI) 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 |
|---|---|---|---|---|---|---|
| Sachem Head Capital Management Activist Value | New | +812.7K | — | $361.5M | 7.6% | 100 |
| Alkeon Capital Management Growth Tech | New | +1.07M | — | $476.8M | 2.0% | 81 |
| Contour Asset Management Long/Short Tech | Sold Out | -374.9K | -100.0% | $166.7M | 0.0% | 80 |
| Glenview Capital Management Long/Short Value | New | +98.5K | — | $43.8M | 0.9% | 66 |
| Senator Investment Group Event | New | +65.0K | — | $28.9M | 1.1% | 64 |
| Squarepoint Ops LLC Quant | New | +67.8K | — | $30.2M | 0.1% | 59 |
| Qube Research & Technologies Ltd Quant | Increased | +531.7K | +715.0% | $236.5M | 0.3% | 59 |
| Tudor Investment Corporation Macro | Sold Out | -81.3K | -100.0% | $36.2M | 0.0% | 58 |
| Holocene Advisors, LP | New | +7.3K | — | $3.2M | 0.0% | 58 |
| Whale Rock Capital Management Growth Tech | Reduced | -35.4K | -2.7% | $15.7M | 4.5% | 57 |
Most significant buyers
By move score, not size.
- Sachem Head Capital Management
- Alkeon Capital Management
- Glenview Capital Management
- Senator Investment Group
- Squarepoint Ops LLC
Most significant sellers
By move score, not size.
- Contour Asset Management
- Tudor Investment Corporation
- Whale Rock Capital Management
- D. E. Shaw & Co., Inc.
- Jain Global
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| Sachem Head Capital Management | 1 | 812.7K | 0 | +812.7K | — | 7.6% | New | 100 |
| Alkeon Capital Management | 1 | 1.1M | 0 | +1.07M | — | 2.0% | New | 81 |
| Contour Asset Management | 2 | 0 | 374.9K | -374.9K | -100.0% | 0.0% | Sold Out | 80 |
| Glenview Capital Management | 2 | 98.5K | 0 | +98.5K | — | 0.9% | New | 66 |
| Senator Investment Group | 2 | 65.0K | 0 | +65.0K | — | 1.1% | New | 64 |
| Squarepoint Ops LLC | 2 | 67.8K | 0 | +67.8K | — | 0.1% | New | 59 |
| Qube Research & Technologies Ltd | 2 | 606.1K | 74.4K | +531.7K | +715.0% | 0.3% | Increased | 59 |
| Tudor Investment Corporation | 2 | 0 | 81.3K | -81.3K | -100.0% | 0.0% | Sold Out | 58 |
| Holocene Advisors, LP | 2 | 7.3K | 0 | +7.3K | — | 0.0% | New | 58 |
| Whale Rock Capital Management | 1 | 1.3M | 1.3M | -35.4K | -2.7% | 4.5% | Reduced | 57 |
| D. E. Shaw & Co., Inc. | 1 | 4.3K | 120.2K | -115.8K | -96.4% | 0.0% | Reduced | 57 |
| MARSHALL WACE, LLP | 2 | 225.1K | 98.7K | +126.4K | +128.1% | 0.1% | Increased | 57 |
| Jain Global | 3 | 0 | 34.4K | -34.4K | -100.0% | 0.0% | Sold Out | 56 |
| Verition Fund Management | 2 | 0 | 3.7K | -3.7K | -100.0% | 0.0% | Sold Out | 56 |
| Hudson Bay Capital Management | 3 | 4.2K | 0 | +4.2K | — | 0.0% | New | 55 |
| Schonfeld Strategic Advisors | 3 | 26.5K | 0 | +26.5K | — | 0.1% | New | 55 |
| Moore Capital Management | 3 | 0 | 10.0K | -10.0K | -100.0% | 0.0% | Sold Out | 55 |
| Weiss Asset Management | 2 | 734 | 0 | +734 | — | 0.0% | New | 54 |
| Woodline Partners LP | 2 | 1.7K | 0 | +1.7K | — | 0.0% | New | 54 |
| Samlyn Capital | 2 | 281.9K | 496.7K | -214.8K | -43.2% | 2.1% | Reduced | 54 |
| Trexquant Investment | 3 | 6.4K | 0 | +6.4K | — | 0.0% | New | 53 |
| LMR Partners | 3 | 1.3K | 0 | +1.3K | — | 0.0% | New | 53 |
| Voloridge Investment Management | 2 | 13.0K | 166.1K | -153.0K | -92.1% | 0.0% | Reduced | 52 |
| Graham Capital Management | 3 | 4.3K | 0 | +4.3K | — | 0.1% | New | 52 |
| Quinn Opportunity Partners | 4 | 0 | 4.4K | -4.4K | -100.0% | 0.0% | Sold Out | 51 |
| Tremblant Capital Group | 2 | 295.4K | 329.8K | -34.4K | -10.4% | 3.8% | Reduced | 50 |
| Aquatic Capital Management | 4 | 0 | 8.0K | -8.0K | -100.0% | 0.0% | Sold Out | 50 |
| Brevan Howard Capital Management | 3 | 58.3K | 8.3K | +50.0K | +603.6% | 0.5% | Increased | 50 |
| Point72 Asset Management, L.P. | 1 | 2.0M | 1.6M | +386.5K | +24.0% | 1.4% | Increased | 50 |
| Centiva Capital | 4 | 0 | 1.9K | -1.9K | -100.0% | 0.0% | Sold Out | 48 |
| Capstone Investment Advisors | 3 | 628 | 13.0K | -12.3K | -95.2% | 0.0% | Reduced | 48 |
| RENAISSANCE TECHNOLOGIES LLC | 1 | 40.4K | 103.6K | -63.2K | -61.0% | 0.0% | Reduced | 47 |
| Maverick Capital | 2 | 2.1K | 7.3K | -5.2K | -71.9% | 0.0% | Reduced | 46 |
| Winton Group | 4 | 6.2K | 1.6K | +4.6K | +287.7% | 0.1% | Increased | 45 |
| TWO SIGMA INVESTMENTS, LP | 2 | 143.4K | 278.7K | -135.3K | -48.6% | 0.1% | Reduced | 44 |
| WORLDQUANT MILLENNIUM ADVISORS LLC | 2 | 19.8K | 43.5K | -23.7K | -54.5% | 0.0% | Reduced | 43 |
| Balyasny Asset Management L.P. | 2 | 260.2K | 407.4K | -147.2K | -36.1% | 0.2% | Reduced | 42 |
| CITADEL ADVISORS LLC | 1 | 697.7K | 947.0K | -249.4K | -26.3% | 0.2% | Reduced | 42 |
| MILLENNIUM MANAGEMENT LLC | 2 | 645.1K | 894.4K | -249.3K | -27.9% | 0.2% | Reduced | 42 |
| Lighthouse Investment Partners | 3 | 2.8K | 12.3K | -9.5K | -77.4% | 0.0% | Reduced | 42 |
| Walleye Capital | 3 | 27.6K | 79.2K | -51.6K | -65.1% | 0.1% | Reduced | 41 |
| Bridgewater Associates | 1 | 27.2K | 38.1K | -10.9K | -28.7% | 0.1% | Reduced | 39 |
| Y-Intercept | 4 | 17.2K | 9.7K | +7.5K | +76.9% | 0.2% | Increased | 39 |
| Engineers Gate | 4 | 4.4K | 19.8K | -15.4K | -77.8% | 0.0% | Reduced | 39 |
| Boothbay Fund Management | 4 | 11.1K | 24.2K | -13.1K | -54.2% | 0.1% | Reduced | 34 |
| Man Group | 3 | 7.2K | 11.3K | -4.1K | -36.2% | 0.0% | Reduced | 32 |
| Gotham Asset Management, LLC | 2 | 170.2K | 195.4K | -25.2K | -12.9% | 0.2% | Reduced | 32 |
| Edgestream Partners | 4 | 26.4K | 42.7K | -16.3K | -38.1% | 0.4% | Reduced | 31 |
| Caxton Associates | 3 | 6.1K | 8.0K | -1.9K | -24.1% | 0.1% | Reduced | 28 |
| ExodusPoint Capital Management | 3 | 65.6K | 60.1K | +5.5K | +9.2% | 0.3% | Increased | 27 |
| Quantbot Technologies | 4 | 7.7K | 5.6K | +2.2K | +38.9% | 0.1% | Increased | 25 |
| AQR Capital Management | 3 | 638.3K | 616.5K | +21.8K | +3.5% | 0.1% | Increased | 23 |
| Caption Management | 3 | 10.0K | 9.0K | +1.0K | +11.1% | 0.2% | 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.