White Mountains Insurance
WTM
356 hedge funds and large institutions have $4.57B invested in White Mountains Insurance in 2026 Q2 according to their latest regulatory filings, with 39 funds opening new positions, 96 increasing their positions, 146 reducing their positions, and 44 closing their positions.
0.65% less ownership
Funds ownership: 89.57% → 88.92% (-0.65%)
3% less funds holding
Funds holding: 368 → 356 (-12)
6% less capital invested
Capital invested by funds: $4.86B → $4.57B (-$289M)
11% less first-time investments, than exits
New positions opened: 39 | Existing positions closed: 44
30% less funds holding in top 10
Funds holding in top 10: 10 → 7 (-3)
34% less repeat investments, than reductions
Existing positions increased: 96 | Existing positions reduced: 146
100% less call options, than puts
Call options by funds: $0 | Put options by funds: $296K
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
American Century Companies
Kansas City,
Missouri
|
+$48.8M |
| 2 |
GJL
Gendell Jeffrey L
|
+$45.9M |
| 3 |
GAM
Gotham Asset Management
New York
|
+$19M |
| 4 |
Qube Research & Technologies (QRT)
London,
United Kingdom
|
+$18.5M |
| 5 |
First Trust Advisors
Wheaton,
Illinois
|
+$16.1M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
CB
Cooke & Bieler
Philadelphia,
Pennsylvania
|
-$42.2M |
| 2 |
FMI
Fiduciary Management Inc
Milwaukee,
Wisconsin
|
-$39.6M |
| 3 |
Morgan Stanley
New York
|
-$26.6M |
| 4 |
Susquehanna International Group
Bala Cynwyd,
Pennsylvania
|
-$24.1M |
| 5 |
Select Equity Group
New York
|
-$23.2M |
WTM Hedge Fund Activity: Q2 2026 in Review
356 of the 8,298 institutional investors tracked by Wall St. Rank reported a position in White Mountains Insurance (WTM) for Q2 2026, worth a combined $4.57B — down 5.9% from $4.86B a quarter earlier.
Sellers outnumbered buyers: 44 funds closed out of WTM and 39 opened new positions — a net loss of 5 holders — while 146 trimmed existing stakes and 96 added.
The largest buyer was American Century Companies, adding an estimated $48.8M. The largest seller was Cooke & Bieler, cutting an estimated $42.2M.
- 356 institutional investors held White Mountains Insurance (WTM) as of Q2 2026, down from 368 in Q1 2026.
- Funds reported $4.57B of White Mountains Insurance stock for Q2 2026, down 5.9% quarter-over-quarter.
- 39 funds opened new White Mountains Insurance positions in Q2 2026 and 44 closed out, a net change of -5 holders.
- The largest White Mountains Insurance buyer in Q2 2026 was American Century Companies, an estimated $48.8M added.
- The largest White Mountains Insurance seller in Q2 2026 was Cooke & Bieler, an estimated $42.2M sold.
Based on aggregated 13F filings for Q2 2026.