ATI ATI Inc.
ATI Inc. (ATI) 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 |
|---|---|---|---|---|---|---|
| Yaupon Capital Management | New | +180.2K | — | $35.5M | 1.2% | 65 |
| VIKING GLOBAL INVESTORS LP Growth | Reduced | -2.18M | -65.4% | $429.5M | 0.7% | 63 |
| Qube Research & Technologies Ltd Quant | Increased | +1.29M | +149.6% | $253.3M | 0.5% | 61 |
| Anomaly Capital Management Long/Short | Sold Out | -74.8K | -100.0% | $14.7M | 0.0% | 61 |
| Bridgewater Associates Quant Macro | Increased | +93.0K | +423.6% | $18.3M | 0.1% | 60 |
| TWO SIGMA INVESTMENTS, LP Quant | Increased | +618.9K | +3481.8% | $122.0M | 0.1% | 59 |
| Rokos Capital Management Macro | Increased | +100.6K | +125.2% | $19.8M | 1.0% | 59 |
| Woodline Partners LP Long/Short | Sold Out | -89.4K | -100.0% | $17.6M | 0.0% | 58 |
| Capula Management Quant Macro | New | +5.6K | — | $1.1M | 0.0% | 58 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Sold Out | -10.5K | -100.0% | $2.1M | 0.0% | 58 |
Most significant buyers
By move score, not size.
- Yaupon Capital Management
- Qube Research & Technologies Ltd
- Bridgewater Associates
- TWO SIGMA INVESTMENTS, LP
- Rokos Capital Management
Most significant sellers
By move score, not size.
- VIKING GLOBAL INVESTORS LP
- Anomaly Capital Management
- Woodline Partners LP
- ADAGE CAPITAL PARTNERS GP, L.L.C.
- Aristeia Capital
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| Yaupon Capital Management | 2 | 180.2K | 0 | +180.2K | — | 1.2% | New | 65 |
| VIKING GLOBAL INVESTORS LP | 1 | 1.2M | 3.3M | -2.18M | -65.4% | 0.7% | Reduced | 63 |
| Qube Research & Technologies Ltd | 2 | 2.1M | 858.8K | +1.29M | +149.6% | 0.5% | Increased | 61 |
| Anomaly Capital Management | 2 | 0 | 74.8K | -74.8K | -100.0% | 0.0% | Sold Out | 61 |
| Bridgewater Associates | 1 | 114.9K | 22.0K | +93.0K | +423.6% | 0.1% | Increased | 60 |
| TWO SIGMA INVESTMENTS, LP | 2 | 636.7K | 17.8K | +618.9K | +3481.8% | 0.1% | Increased | 59 |
| Rokos Capital Management | 2 | 180.9K | 80.3K | +100.6K | +125.2% | 1.0% | Increased | 59 |
| Woodline Partners LP | 2 | 0 | 89.4K | -89.4K | -100.0% | 0.0% | Sold Out | 58 |
| Capula Management | 2 | 5.6K | 0 | +5.6K | — | 0.0% | New | 58 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 2 | 0 | 10.5K | -10.5K | -100.0% | 0.0% | Sold Out | 58 |
| Magnetar Capital | 2 | 5.9K | 0 | +5.9K | — | 0.0% | New | 57 |
| Trexquant Investment | 3 | 69.8K | 0 | +69.8K | — | 0.1% | New | 55 |
| LMR Partners | 3 | 16.0K | 0 | +16.0K | — | 0.0% | New | 55 |
| Aristeia Capital | 2 | 0 | 3.3K | -3.3K | -100.0% | 0.0% | Sold Out | 54 |
| Caxton Associates | 3 | 1.3K | 0 | +1.3K | — | 0.0% | New | 53 |
| Graham Capital Management | 3 | 14.7K | 0 | +14.7K | — | 0.1% | New | 52 |
| Schonfeld Strategic Advisors | 3 | 177.8K | 23.5K | +154.2K | +655.0% | 0.2% | Increased | 50 |
| Jain Global | 3 | 31.7K | 264.5K | -232.8K | -88.0% | 0.1% | Reduced | 50 |
| D. E. Shaw & Co., Inc. | 1 | 815.6K | 1.7M | -927.0K | -53.2% | 0.1% | Reduced | 49 |
| Verition Fund Management | 2 | 2.6K | 39.1K | -36.6K | -93.4% | 0.0% | Reduced | 48 |
| Centiva Capital | 4 | 1.9K | 0 | +1.9K | — | 0.0% | New | 48 |
| Holocene Advisors, LP | 2 | 497.6K | 1.1M | -600.0K | -54.7% | 0.2% | Reduced | 48 |
| Point72 Asset Management, L.P. | 1 | 1.2M | 1.9M | -692.2K | -35.8% | 0.4% | Reduced | 48 |
| Chilton Investment Company | 2 | 4.8K | 2.5K | +2.3K | +95.0% | 0.0% | Increased | 47 |
| CITADEL ADVISORS LLC | 1 | 497.4K | 303.3K | +194.1K | +64.0% | 0.1% | Increased | 47 |
| Brevan Howard Capital Management | 3 | 117.6K | 62.7K | +54.8K | +87.5% | 0.4% | Increased | 46 |
| Hudson Bay Capital Management | 3 | 50.9K | 27.4K | +23.5K | +85.9% | 0.1% | Increased | 46 |
| Boothbay Fund Management | 4 | 14.0K | 2.3K | +11.7K | +510.6% | 0.1% | Increased | 45 |
| Alphadyne Asset Management | 3 | 117 | 4.2K | -4.1K | -97.2% | 0.0% | Reduced | 45 |
| Tudor Investment Corporation | 2 | 148.6K | 88.9K | +59.7K | +67.1% | 0.1% | Increased | 44 |
| WORLDQUANT MILLENNIUM ADVISORS LLC | 2 | 96.9K | 58.0K | +38.9K | +67.0% | 0.1% | Increased | 44 |
| Senator Investment Group | 2 | 80.0K | 145.0K | -65.0K | -44.8% | 0.6% | Reduced | 43 |
| Balyasny Asset Management L.P. | 2 | 514.1K | 851.7K | -337.6K | -39.6% | 0.2% | Reduced | 43 |
| MILLENNIUM MANAGEMENT LLC | 2 | 875.3K | 619.2K | +256.0K | +41.3% | 0.1% | Increased | 43 |
| Voleon Capital Management | 3 | 154.3K | 98.9K | +55.4K | +56.0% | 0.6% | Increased | 41 |
| Squarepoint Ops LLC | 2 | 9.3K | 22.8K | -13.5K | -59.1% | 0.0% | Reduced | 40 |
| Capstone Investment Advisors | 3 | 10.8K | 25.0K | -14.2K | -56.6% | 0.0% | Reduced | 38 |
| MARSHALL WACE, LLP | 2 | 709.6K | 536.5K | +173.1K | +32.3% | 0.2% | Increased | 38 |
| Walleye Capital | 3 | 77.4K | 146.1K | -68.7K | -47.0% | 0.1% | Reduced | 37 |
| Hawk Ridge Capital Management | 2 | 204.7K | 185.6K | +19.1K | +10.3% | 1.3% | Increased | 35 |
| Quadrature Capital | 3 | 23.6K | 41.6K | -18.0K | -43.2% | 0.0% | Reduced | 35 |
| Aquatic Capital Management | 4 | 55.8K | 40.4K | +15.4K | +38.2% | 0.4% | Increased | 30 |
| Winton Group | 4 | 13.4K | 8.9K | +4.5K | +50.5% | 0.1% | Increased | 30 |
| Capital Fund Management | 3 | 19.9K | 25.8K | -5.9K | -22.8% | 0.0% | Reduced | 30 |
| AQR Capital Management | 3 | 1.4M | 1.2M | +210.4K | +17.2% | 0.1% | Increased | 28 |
| ExodusPoint Capital Management | 3 | 73.1K | 88.2K | -15.1K | -17.1% | 0.1% | Reduced | 28 |
| Y-Intercept | 4 | 21.0K | 31.6K | -10.6K | -33.7% | 0.1% | Reduced | 28 |
| Gotham Asset Management, LLC | 2 | 269.6K | 260.5K | +9.1K | +3.5% | 0.1% | Increased | 27 |
| Engineers Gate | 4 | 87.0K | 68.9K | +18.1K | +26.3% | 0.2% | Increased | 27 |
| Moore Capital Management | 3 | 30.9K | 33.9K | -3.0K | -8.8% | 0.2% | Reduced | 24 |
| Quantbot Technologies | 4 | 27.2K | 21.6K | +5.5K | +25.5% | 0.2% | Increased | 24 |
| Edgestream Partners | 4 | 10.7K | 9.5K | +1.1K | +12.1% | 0.1% | Increased | 21 |
| Man Group | 3 | 59.6K | 59.5K | +21 | +0.0% | 0.0% | Increased | 21 |
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.