WTM White Mountains Insurance Group, Ltd.
White Mountains Insurance Group, Ltd. (WTM) 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 |
|---|---|---|---|---|---|---|
| Select Equity Group Long/Short Growth | Sold Out | -10.6K | -100.0% | $21.9M | 0.0% | 63 |
| Bridgewater Associates Quant Macro | Sold Out | -414 | -100.0% | $858.4K | 0.0% | 61 |
| RENAISSANCE TECHNOLOGIES LLC Quant | Sold Out | -2.6K | -100.0% | $5.4M | 0.0% | 60 |
| MARSHALL WACE, LLP Long/Short | Sold Out | -3.9K | -100.0% | $8.0M | 0.0% | 58 |
| WORLDQUANT MILLENNIUM ADVISORS LLC Quant | New | +591 | — | $1.2M | 0.0% | 58 |
| Capula Management Quant Macro | Sold Out | -921 | -100.0% | $1.9M | 0.0% | 58 |
| Squarepoint Ops LLC Quant | New | +905 | — | $1.9M | 0.0% | 57 |
| Weiss Asset Management Event Quant | Sold Out | -120 | -100.0% | $248.8K | 0.0% | 54 |
| CITADEL ADVISORS LLC Quant | Increased | +4.5K | +174.1% | $9.4M | 0.0% | 54 |
| Lighthouse Investment Partners | New | +1.9K | — | $3.9M | 0.1% | 53 |
Most significant buyers
By move score, not size.
- WORLDQUANT MILLENNIUM ADVISORS LLC
- Squarepoint Ops LLC
- CITADEL ADVISORS LLC
- Lighthouse Investment Partners
- Walleye Capital
Most significant sellers
By move score, not size.
- Select Equity Group
- Bridgewater Associates
- RENAISSANCE TECHNOLOGIES LLC
- MARSHALL WACE, LLP
- Capula Management
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| Select Equity Group | 1 | 0 | 10.6K | -10.6K | -100.0% | 0.0% | Sold Out | 63 |
| Bridgewater Associates | 1 | 0 | 414 | -414 | -100.0% | 0.0% | Sold Out | 61 |
| RENAISSANCE TECHNOLOGIES LLC | 1 | 0 | 2.6K | -2.6K | -100.0% | 0.0% | Sold Out | 60 |
| MARSHALL WACE, LLP | 2 | 0 | 3.9K | -3.9K | -100.0% | 0.0% | Sold Out | 58 |
| WORLDQUANT MILLENNIUM ADVISORS LLC | 2 | 591 | 0 | +591 | — | 0.0% | New | 58 |
| Capula Management | 2 | 0 | 921 | -921 | -100.0% | 0.0% | Sold Out | 58 |
| Squarepoint Ops LLC | 2 | 905 | 0 | +905 | — | 0.0% | New | 57 |
| Weiss Asset Management | 2 | 0 | 120 | -120 | -100.0% | 0.0% | Sold Out | 54 |
| CITADEL ADVISORS LLC | 1 | 7.1K | 2.6K | +4.5K | +174.1% | 0.0% | Increased | 54 |
| Lighthouse Investment Partners | 3 | 1.9K | 0 | +1.9K | — | 0.1% | New | 53 |
| Walleye Capital | 3 | 1.1K | 0 | +1.1K | — | 0.0% | New | 53 |
| Qube Research & Technologies Ltd | 2 | 9.7K | 1.0K | +8.7K | +852.1% | 0.0% | Increased | 53 |
| Gotham Asset Management, LLC | 2 | 17.9K | 9.0K | +8.9K | +98.3% | 0.1% | Increased | 52 |
| ExodusPoint Capital Management | 3 | 1.4K | 611 | +832 | +136.2% | 0.0% | Increased | 48 |
| Edgestream Partners | 4 | 6.6K | 3.1K | +3.4K | +110.2% | 0.4% | Increased | 47 |
| MILLENNIUM MANAGEMENT LLC | 2 | 143 | 387 | -244 | -63.0% | 0.0% | Reduced | 42 |
| Quantbot Technologies | 4 | 112 | 13 | +99 | +761.5% | 0.0% | Increased | 39 |
| D. E. Shaw & Co., Inc. | 1 | 6.6K | 8.9K | -2.3K | -25.7% | 0.0% | Reduced | 35 |
| Aquatic Capital Management | 4 | 361 | 912 | -551 | -60.4% | 0.0% | Reduced | 34 |
| AQR Capital Management | 3 | 5.5K | 7.7K | -2.3K | -29.6% | 0.0% | Reduced | 29 |
| Quadrature Capital | 3 | 859 | 1.2K | -354 | -29.2% | 0.0% | Reduced | 29 |
| Jain Global | 3 | 467 | 396 | +71 | +17.9% | 0.0% | Increased | 25 |
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.