Robeco Institutional Asset Management
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Robeco Institutional Asset Management’s White Mountains Insurance WTM Stock Holding History

Robeco Institutional Asset Management’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 		$4.53M Buy
2,184
+5
+0.2% +$10.7K 0.01% 550
2026
Q1 		$4.79M Buy
2,179
+1,556
+250% +$3.33M 0.01% 554
2025
Q4 		$1.29M Sell
623
-16,616
-96% -$32.5M ﹤0.01% 705
2025
Q3 		$28.8M Sell
17,239
-583
-3% -$1.04M 0.04% 303
2025
Q2 		$32M Sell
17,822
-1,332
-7% -$2.37M 0.05% 280
2025
Q1 		$36.9M Sell
19,154
-263
-1% -$495K 0.07% 238
2024
Q4 		$37.8M Sell
19,417
-899
-4% -$1.7M 0.07% 231
2024
Q3 		$34.5M Sell
20,316
-1,062
-5% -$1.85M 0.07% 254
2024
Q2 		$38.9M Sell
21,378
-8,245
-28% -$14.6M 0.08% 217
2024
Q1 		$53.2M Sell
29,623
-167
-0.6% -$280K 0.12% 180
2023
Q4 		$44.8M Sell
29,790
-2,122
-7% -$3.15M 0.11% 201
2023
Q3 		$47.7M Buy
31,912
+234
+0.7% +$359K 0.13% 179
2023
Q2 		$44M Sell
31,678
-489
-2% -$688K 0.12% 192
2023
Q1 		$44.3M Buy
32,167
+9,569
+42% +$13.7M 0.12% 188
2022
Q4 		$32M Buy
22,598
+12,724
+129% +$17.2M 0.09% 227
2022
Q3 		$12.9M Sell
9,874
-435
-4% -$563K 0.04% 347
2022
Q2 		$12.8M Sell
10,309
-44
-0.4% -$51.1K 0.04% 362
2022
Q1 		$11.8M Sell
10,353
-1,726
-14% -$1.81M 0.03% 428
2021
Q4 		$12.2M Sell
12,079
-6,033
-33% -$6.37M 0.03% 431
2021
Q3 		$19.4M Hold
18,112
– – 0.04% 360
2021
Q2 		$20.8M Sell
18,112
-4,309
-19% -$5.03M 0.05% 356
2021
Q1 		$25M Sell
22,421
-4,342
-16% -$4.86M 0.06% 305
2020
Q4 		$26.8M Sell
26,763
-4,992
-16% -$4.7M 0.07% 283
2020
Q3 		$24.7M Sell
31,755
-6,463
-17% -$5.59M 0.08% 263
2020
Q2 		$33.9M Sell
38,218
-1,851
-5% -$1.67M 0.12% 202
2020
Q1 		$36.5M Hold
40,069
– – 0.15% 184
2019
Q4 		$44.7M Sell
40,069
-198
-0.5% -$216K 0.14% 196
2019
Q3 		$43.5M Sell
40,267
-942
-2% -$1M 0.15% 180
2019
Q2 		$42.1M Hold
41,209
– – 0.15% 195
2019
Q1 		$38.1M Buy
41,209
+11,810
+40% +$10.7M 0.14% 202
2018
Q4 		$25.2M Buy
29,399
+13,843
+89% +$12.3M 0.11% 231
2018
Q3 		$14.6M Buy
+15,556
New +$14.4M 0.06% 363

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

Robeco Institutional Asset Management's WTM Position: Q2 2026 in Review

Robeco Institutional Asset Management increased its White Mountains Insurance (WTM) stake by 0.23% in Q2 2026, buying an estimated $10.7K and bringing the position to 2,184 shares worth $4.53M. The position accounts for 0.01% of the portfolio, ranked #550.

Robeco Institutional Asset Management first reported a position in WTM in Q3 2018 and has held it in 32 quarters since. The position peaked at $53.2M in Q1 2024. 357 funds tracked by Wall St. Rank hold WTM as of Q2 2026.

  • Robeco Institutional Asset Management held 2,184 shares of White Mountains Insurance worth $4.53M as of Q2 2026.
  • Robeco Institutional Asset Management bought 5 White Mountains Insurance shares in Q2 2026, an estimated $10.7K.
  • White Mountains Insurance made up 0.01% of Robeco Institutional Asset Management's portfolio in Q2 2026, its #550 holding.
  • Robeco Institutional Asset Management first reported a position in White Mountains Insurance in Q3 2018 and has held it in 32 quarters since.
  • Robeco Institutional Asset Management's White Mountains Insurance position peaked at $53.2M in Q1 2024.
  • 357 funds tracked by Wall St. Rank held White Mountains Insurance as of Q2 2026.

Based on Robeco Institutional Asset Management's 13F filing for Q2 2026, filed 21 Jul 2026.