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White Mountains Insurance
367 hedge funds and large institutions have $4.85B invested in White Mountains Insurance in 2026 Q1 according to their latest regulatory filings, with 50 funds opening new positions, 119 increasing their positions, 111 reducing their positions, and 25 closing their positions.
New
Increased
Maintained
Reduced
Closed
100% more first-time investments, than exits
New positions opened: 50 | Existing positions closed: 25
25% more funds holding in top 10
Funds holding in top 10: 8 → 10 (+2)
5% more funds holding
Funds holding: 351 → 367 (+16)
1.14% more ownership
Funds ownership: 88.41% → 89.55% (+1.1%)
7% more repeat investments, than reductions
Existing positions increased: 119 | Existing positions reduced: 111
4% more capital invested
Capital invested by funds: $4.67B → $4.85B (+$182M)
Holders
367
Holders Change
+16
Holders Change %
+4.56%
% of All Funds
4.52%
Holding in Top 10
10
Holding in Top 10 Change
+2
Holding in Top 10 Change %
+25%
% of All Funds
0.12%
New
50
Increased
119
Reduced
111
Closed
25
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–
Top Buyers
| 1 |
BGIM
Boussard & Gavaudan Investment Management
London,
United Kingdom
|
+$29.9M |
| 2 |
Jane Street
New York
|
+$25.9M |
| 3 |
Susquehanna International Group
Bala Cynwyd,
Pennsylvania
|
+$23.2M |
| 4 |
Goldman Sachs
New York
|
+$22.5M |
| 5 |
American Century Companies
Kansas City,
Missouri
|
+$15.9M |
Top Sellers
| 1 |
Morgan Stanley
New York
|
-$48.9M |
| 2 |
Boston Partners
Boston,
Massachusetts
|
-$41.6M |
| 3 |
SAM
Southeastern Asset Management
Memphis,
Tennessee
|
-$27.4M |
| 4 |
Select Equity Group
New York
|
-$19.6M |
| 5 |
RP
Reinhart Partners
Mequon,
Wisconsin
|
-$14.1M |
