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WMIG

White Mountains Insurance Group Portfolio holdings

AUM $313M
1-Year Est. Return 14.8%
This Fund
S&P 500
This Quarter Est. Return
+12.46%
1 Year Est. Return
+14.8%
3 Year Est. Return
+45.79%
5 Year Est. Return
-49.99%
10 Year Est. Return
–
AUM
$262M
AUM Growth
+$58.7M
Cap. Flow
+$30.4M
Cap. Flow %
11.61%
Top 10 Hldgs %
100%
Holding
2
New
1
Increased
–
Reduced
–
Closed
–

Top Buys

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$30.4M

Top Sells

No sells this quarter

Sector Composition

Rank Sector Weight
1 Communication Services 88.28%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
MAX icon
1
MediaAlpha
MAX
$746M
$231M 88.28%
17,856,614
– –
SPY icon
2
State Street SPDR S&P 500 ETF Trust
SPY
$771B
$30.7M 11.72%
+45,000
New +$30.4M

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White Mountains Insurance Group's Q4 2025 Portfolio in Review

As of Q4 2025, White Mountains Insurance Group held 2 positions worth $262M, up 29% from $203M the previous quarter. Its ten largest holdings account for 100% of the portfolio.

White Mountains Insurance Group deployed $30.4M of net new capital in Q4 2025, opening 1 new position. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 45,000 shares worth $30.7M.

By sector, the portfolio is most concentrated in Communication Services at 88% of assets, down from 100% a quarter earlier.

  • White Mountains Insurance Group's largest Q4 2025 buy was State Street SPDR S&P 500 ETF Trust: 45,000 shares worth $30.7M.
  • White Mountains Insurance Group's ten largest holdings make up 100% of its $262M portfolio in Q4 2025.
  • White Mountains Insurance Group opened 1 new position and closed 0 in Q4 2025.
  • White Mountains Insurance Group's portfolio value rose 29% quarter-over-quarter to $262M.

Based on White Mountains Insurance Group's 13F filing for Q4 2025, filed 12 Feb 2026.