White Mountains Insurance
WTM
368 hedge funds and large institutions have $4.86B invested in White Mountains Insurance in 2026 Q1 according to their latest regulatory filings, with 50 funds opening new positions, 120 increasing their positions, 111 reducing their positions, and 27 closing their positions.
85% more first-time investments, than exits
New positions opened: 50 | Existing positions closed: 27
25% more funds holding in top 10
Funds holding in top 10: 8 → 10 (+2)
5% more funds holding
Funds holding: 352 → 368 (+16)
1.18% more ownership
Funds ownership: 88.38% → 89.57% (+1.2%)
8% more repeat investments, than reductions
Existing positions increased: 120 | Existing positions reduced: 111
4% more capital invested
Capital invested by funds: $4.67B → $4.86B (+$185M)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 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
| Rank | Fund | Capital Flow |
|---|---|---|
| 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 |
WTM Hedge Fund Activity: Q1 2026 in Review
368 of the 8,182 institutional investors tracked by Wall St. Rank reported a position in White Mountains Insurance (WTM) for Q1 2026, worth a combined $4.86B — up 4% from $4.67B a quarter earlier.
Buyers outnumbered sellers: 50 funds opened new WTM positions and 27 closed out — a net gain of 23 holders — while 120 added to existing stakes and 111 trimmed.
The largest buyer was Boussard & Gavaudan Investment Management, opening a new position worth an estimated $29.9M. The largest seller was Morgan Stanley, cutting an estimated $48.9M.
- 368 institutional investors held White Mountains Insurance (WTM) as of Q1 2026, up from 352 in Q4 2025.
- Funds reported $4.86B of White Mountains Insurance stock for Q1 2026, up 4% quarter-over-quarter.
- 50 funds opened new White Mountains Insurance positions in Q1 2026 and 27 closed out, a net change of +23 holders.
- The largest White Mountains Insurance buyer in Q1 2026 was Boussard & Gavaudan Investment Management, an estimated $29.9M added.
- The largest White Mountains Insurance seller in Q1 2026 was Morgan Stanley, an estimated $48.9M sold.
Based on aggregated 13F filings for Q1 2026.