Arrowstreet Capital
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Arrowstreet Capital’s White Mountains Insurance WTM Stock Holding History

Arrowstreet Capital’s Portfolio WTM Stock Details WTM Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$15.1M Buy
7,284
+5,371
+281% +$11.5M 0.01% 952
2026
Q1 		$4.2M Buy
1,913
+1,102
+136% +$2.36M ﹤0.01% 1209
2025
Q4 		$1.69M Buy
+811
New +$1.59M ﹤0.01% 1449
2021
Q2 		– Sell
-700
Closed -$780K – 2263
2021
Q1 		$780K Buy
+700
New +$783K ﹤0.01% 1875
2020
Q4 		– Sell
-300
Closed -$234K – 2575
2020
Q3 		$234K Buy
+300
New +$259K ﹤0.01% 2174
2016
Q2 		– Sell
-1,096
Closed -$880K – 1534
2016
Q1 		$880K Hold
1,096
– – ﹤0.01% 1002
2015
Q4 		$797K Sell
1,096
-3,280
-75% -$2.51M ﹤0.01% 1044
2015
Q3 		$3.27M Sell
4,376
-1,448
-25% -$1.04M 0.02% 637
2015
Q2 		$3.81M Sell
5,824
-100
-2% -$66.3K 0.02% 490
2015
Q1 		$4.05M Sell
5,924
-3,964
-40% -$2.62M 0.03% 455
2014
Q4 		$6.23M Sell
9,888
-2,618
-21% -$1.66M 0.04% 399
2014
Q3 		$7.88M Sell
12,506
-64
-0.5% -$39.9K 0.04% 318
2014
Q2 		$7.65M Buy
12,570
+3,042
+32% +$1.81M 0.04% 344
2014
Q1 		$5.72M Buy
9,528
+399
+4% +$233K 0.03% 412
2013
Q4 		$5.51M Buy
9,129
+8,821
+2,864% +$5.2M 0.03% 420
2013
Q3 		$175K Sell
308
-1,187
-79% -$689K ﹤0.01% 907
2013
Q2 		$860K Buy
+1,495
New +$872K 0.01% 560

Other funds holding WTM

Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Neuberger Berman Group
Neuberger Berman Group New York $150B AUM 40.08% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
RRAM
River Road Asset Management Louisville, Kentucky $8.99B AUM 12.83% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $36.7B AUM 74.15% 1-Year Est. Return
CB
Cooke & Bieler Philadelphia, Pennsylvania $8.65B AUM 9.66% 1-Year Est. Return
WCM
Wallace Capital Management Dallas, Texas $912M AUM 21.45% 1-Year Est. Return
FMI
Fiduciary Management Inc Milwaukee, Wisconsin $7.03B AUM 11.68% 1-Year Est. Return

Arrowstreet Capital's WTM Position: Q2 2026 in Review

Arrowstreet Capital increased its White Mountains Insurance (WTM) stake by 281% in Q2 2026, buying an estimated $11.5M and bringing the position to 7,284 shares worth $15.1M. The position accounts for 0.01% of the portfolio, ranked #952.

Arrowstreet Capital first reported a position in WTM in Q2 2013 and has held it in 17 quarters since. 356 funds tracked by Wall St. Rank hold WTM as of Q2 2026.

  • Arrowstreet Capital held 7,284 shares of White Mountains Insurance worth $15.1M as of Q2 2026.
  • Arrowstreet Capital bought 5,371 White Mountains Insurance shares in Q2 2026, an estimated $11.5M.
  • White Mountains Insurance made up 0.01% of Arrowstreet Capital's portfolio in Q2 2026, its #952 holding.
  • Arrowstreet Capital first reported a position in White Mountains Insurance in Q2 2013 and has held it in 17 quarters since.
  • 356 funds tracked by Wall St. Rank held White Mountains Insurance as of Q2 2026.

Based on Arrowstreet Capital's 13F filing for Q2 2026, filed 13 Aug 2026.