AJG Arthur J. Gallagher & Co.
Arthur J. Gallagher & Co. (AJG) 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 |
|---|---|---|---|---|---|---|
| Brave Warrior Advisors Value | New | +1.29M | — | $295.0M | 6.4% | 92 |
| VIKING GLOBAL INVESTORS LP Growth | Sold Out | -727.4K | -100.0% | $167.0M | 0.0% | 71 |
| Prana Capital Management Long/Short | New | +224.3K | — | $51.5M | 1.6% | 67 |
| RENAISSANCE TECHNOLOGIES LLC Quant | Sold Out | -76.6K | -100.0% | $17.6M | 0.0% | 62 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Increased | +458.2K | +134.5% | $105.2M | 0.3% | 59 |
| Verition Fund Management Event Long/Short | Sold Out | -90.6K | -100.0% | $20.8M | 0.0% | 59 |
| CITADEL ADVISORS LLC Quant | Reduced | -651.9K | -85.5% | $149.7M | 0.0% | 57 |
| MARSHALL WACE, LLP Long/Short | Reduced | -272.3K | -98.5% | $62.5M | 0.0% | 56 |
| Point72 Asset Management, L.P. | Increased | +32.1K | +104.0% | $7.4M | 0.0% | 55 |
| Moore Capital Management Macro | New | +18.5K | — | $4.2M | 0.1% | 55 |
Most significant buyers
By move score, not size.
- Brave Warrior Advisors
- Prana Capital Management
- ADAGE CAPITAL PARTNERS GP, L.L.C.
- Point72 Asset Management, L.P.
- Moore Capital Management
Most significant sellers
By move score, not size.
- VIKING GLOBAL INVESTORS LP
- RENAISSANCE TECHNOLOGIES LLC
- Verition Fund Management
- CITADEL ADVISORS LLC
- MARSHALL WACE, LLP
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| Brave Warrior Advisors | 2 | 1.3M | 0 | +1.29M | — | 6.4% | New | 92 |
| VIKING GLOBAL INVESTORS LP | 1 | 0 | 727.4K | -727.4K | -100.0% | 0.0% | Sold Out | 71 |
| Prana Capital Management | 3 | 224.3K | 0 | +224.3K | — | 1.6% | New | 67 |
| RENAISSANCE TECHNOLOGIES LLC | 1 | 0 | 76.6K | -76.6K | -100.0% | 0.0% | Sold Out | 62 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 2 | 799.0K | 340.8K | +458.2K | +134.5% | 0.3% | Increased | 59 |
| Verition Fund Management | 2 | 0 | 90.6K | -90.6K | -100.0% | 0.0% | Sold Out | 59 |
| CITADEL ADVISORS LLC | 1 | 110.8K | 762.7K | -651.9K | -85.5% | 0.0% | Reduced | 57 |
| MARSHALL WACE, LLP | 2 | 4.1K | 276.4K | -272.3K | -98.5% | 0.0% | Reduced | 56 |
| Point72 Asset Management, L.P. | 1 | 63.0K | 30.9K | +32.1K | +104.0% | 0.0% | Increased | 55 |
| Moore Capital Management | 3 | 18.5K | 0 | +18.5K | — | 0.1% | New | 55 |
| Jain Global | 3 | 0 | 32.9K | -32.9K | -100.0% | 0.0% | Sold Out | 54 |
| Man Group | 3 | 10.3K | 0 | +10.3K | — | 0.0% | New | 54 |
| Gotham Asset Management, LLC | 2 | 227.9K | 63.6K | +164.3K | +258.3% | 0.1% | Increased | 53 |
| Armistice Capital | 3 | 1.1K | 0 | +1.1K | — | 0.0% | New | 53 |
| Winton Group | 4 | 0 | 21.7K | -21.7K | -100.0% | 0.0% | Sold Out | 51 |
| Voleon Capital Management | 3 | 0 | 925 | -925 | -100.0% | 0.0% | Sold Out | 51 |
| Y-Intercept | 4 | 0 | 8.6K | -8.6K | -100.0% | 0.0% | Sold Out | 50 |
| Engineers Gate | 4 | 0 | 4.6K | -4.6K | -100.0% | 0.0% | Sold Out | 50 |
| Schonfeld Strategic Advisors | 3 | 118.8K | 3.9K | +115.0K | +2957.5% | 0.2% | Increased | 50 |
| Boothbay Fund Management | 4 | 1.1K | 0 | +1.1K | — | 0.0% | New | 49 |
| Brevan Howard Capital Management | 3 | 8.1K | 2.1K | +6.0K | +292.5% | 0.0% | Increased | 45 |
| Squarepoint Ops LLC | 2 | 12.1K | 6.8K | +5.3K | +77.4% | 0.0% | Increased | 45 |
| Chilton Investment Company | 2 | 413.1K | 490.5K | -77.4K | -15.8% | 2.4% | Reduced | 44 |
| MILLENNIUM MANAGEMENT LLC | 2 | 136.1K | 234.0K | -97.9K | -41.8% | 0.0% | Reduced | 41 |
| Woodline Partners LP | 2 | 596.5K | 840.7K | -244.2K | -29.0% | 0.4% | Reduced | 40 |
| Alyeska Investment Group, L.P. | 2 | 105.4K | 169.6K | -64.2K | -37.8% | 0.1% | Reduced | 39 |
| Interval Partners | 3 | 58.1K | 39.3K | +18.7K | +47.6% | 0.4% | Increased | 38 |
| Parallax Volatility Advisers | 3 | 222 | 531 | -309 | -58.2% | 0.0% | Reduced | 33 |
| Balyasny Asset Management L.P. | 2 | 267.2K | 239.0K | +28.2K | +11.8% | 0.1% | Increased | 32 |
| Polar Asset Management Partners | 3 | 23.1K | 19.0K | +4.1K | +21.6% | 0.2% | Increased | 28 |
| Walleye Capital | 3 | 268 | 204 | +64 | +31.4% | 0.0% | Increased | 28 |
| Lighthouse Investment Partners | 3 | 104.4K | 99.1K | +5.3K | +5.3% | 0.8% | Increased | 27 |
| AQR Capital Management | 3 | 170.3K | 147.1K | +23.2K | +15.8% | 0.0% | Increased | 26 |
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.