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
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 $481B AUM 30.42% 1-Year Est. Return
Neuberger Berman Group
Neuberger Berman Group New York $131B AUM 28.36% 1-Year Est. Return
RRAM
River Road Asset Management Louisville, Kentucky $8.99B AUM 12.83% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
CB
Cooke & Bieler Philadelphia, Pennsylvania $8.84B AUM 6.92% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $29.7B AUM 43.33% 1-Year Est. Return
FMI
Fiduciary Management Inc Milwaukee, Wisconsin $8.06B AUM 6.78% 1-Year Est. Return
WCM
Wallace Capital Management Dallas, Texas $871M AUM 13.69% 1-Year Est. Return

Robeco Institutional Asset Management's WTM Position: Q1 2026 in Review

Robeco Institutional Asset Management increased its White Mountains Insurance (WTM) stake by 250% in Q1 2026, buying an estimated $3.33M and bringing the position to 2,179 shares worth $4.79M. The position accounts for 0.01% of the portfolio, ranked #554.

Robeco Institutional Asset Management first reported a position in WTM in Q3 2018 and has held it in 31 quarters since. The position peaked at $53.2M in Q1 2024. 367 funds tracked by Wall St. Rank hold WTM as of Q1 2026.

  • Robeco Institutional Asset Management held 2,179 shares of White Mountains Insurance worth $4.79M as of Q1 2026.
  • Robeco Institutional Asset Management bought 1,556 White Mountains Insurance shares in Q1 2026, an estimated $3.33M.
  • White Mountains Insurance made up 0.01% of Robeco Institutional Asset Management's portfolio in Q1 2026, its #554 holding.
  • Robeco Institutional Asset Management first reported a position in White Mountains Insurance in Q3 2018 and has held it in 31 quarters since.
  • Robeco Institutional Asset Management's White Mountains Insurance position peaked at $53.2M in Q1 2024.
  • 367 funds tracked by Wall St. Rank held White Mountains Insurance as of Q1 2026.

Based on Robeco Institutional Asset Management's 13F filing for Q1 2026, filed 21 Apr 2026.