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Thompson Siegel & Walmsley’s White Mountains Insurance WTM Stock Holding History

Thompson Siegel & Walmsley’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 		$15.8M Sell
7,209
-1,718
-19% -$3.68M 0.28% 91
2025
Q4 		$18.6M Buy
8,927
+275
+3% +$538K 0.31% 89
2025
Q3 		$14.5M Buy
8,652
+347
+4% +$619K 0.23% 104
2025
Q2 		$14.9M Sell
8,305
-12
-0.1% -$21.3K 0.25% 98
2025
Q1 		$16M Sell
8,317
-1,929
-19% -$3.63M 0.27% 93
2024
Q4 		$19.9M Sell
10,246
-117
-1% -$221K 0.31% 90
2024
Q3 		$17.6M Sell
10,363
-1,554
-13% -$2.71M 0.26% 90
2024
Q2 		$21.7M Sell
11,917
-3,948
-25% -$6.98M 0.35% 77
2024
Q1 		$28.5M Buy
15,865
+70
+0.4% +$117K 0.44% 73
2023
Q4 		$23.8M Sell
15,795
-463
-3% -$688K 0.38% 79
2023
Q3 		$24.3M Sell
16,258
-1,152
-7% -$1.77M 0.4% 78
2023
Q2 		$24.2M Sell
17,410
-7
-0% -$9.86K 0.39% 77
2023
Q1 		$24M Sell
17,417
-2,412
-12% -$3.46M 0.39% 80
2022
Q4 		$28M Buy
19,829
+672
+4% +$911K 0.45% 73
2022
Q3 		$25M Sell
19,157
-3,622
-16% -$4.69M 0.43% 78
2022
Q2 		$28.4M Sell
22,779
-6,249
-22% -$7.26M 0.46% 74
2022
Q1 		$33M Sell
29,028
-195
-0.7% -$204K 0.47% 67
2021
Q4 		$29.6M Sell
29,223
-1,529
-5% -$1.62M 0.41% 78
2021
Q3 		$32.9M Buy
30,752
+27
+0.1% +$30.2K 0.47% 66
2021
Q2 		$35.3M Sell
30,725
-263
-0.8% -$307K 0.48% 68
2021
Q1 		$34.5M Buy
30,988
+3,146
+11% +$3.52M 0.49% 68
2020
Q4 		$27.9M Sell
27,842
-61
-0.2% -$57.4K 0.45% 70
2020
Q3 		$21.7M Buy
27,903
+5,323
+24% +$4.6M 0.42% 70
2020
Q2 		$20.1M Buy
22,580
+283
+1% +$255K 0.4% 74
2020
Q1 		$20.3M Buy
22,297
+1,842
+9% +$1.91M 0.48% 68
2019
Q4 		$22.8M Sell
20,455
-88
-0.4% -$96K 0.35% 82
2019
Q3 		$22.2M Sell
20,543
-1,824
-8% -$1.95M 0.35% 81
2019
Q2 		$22.8M Sell
22,367
-2,048
-8% -$1.97M 0.33% 83
2019
Q1 		$22.6M Buy
24,415
+406
+2% +$368K 0.32% 84
2018
Q4 		$20.6M Sell
24,009
-1,763
-7% -$1.57M 0.32% 86
2018
Q3 		$24.1M Sell
25,772
-11,015
-30% -$10.2M 0.31% 90
2018
Q2 		$33.4M Sell
36,787
-11,332
-24% -$9.98M 0.43% 75
2018
Q1 		$39.6M Buy
48,119
+5,686
+13% +$4.69M 0.49% 65
2017
Q4 		$36.1M Sell
42,433
-208
-0.5% -$182K 0.43% 68
2017
Q3 		$36.5M Buy
42,641
+10,135
+31% +$8.71M 0.44% 71
2017
Q2 		$28.2M Buy
32,506
+223
+0.7% +$193K 0.33% 81
2017
Q1 		$28.4M Sell
32,283
-767
-2% -$687K 0.33% 85
2016
Q4 		$27.6M Sell
33,050
-3,972
-11% -$3.33M 0.36% 86
2016
Q3 		$30.7M Buy
37,022
+5,694
+18% +$4.69M 0.48% 76
2016
Q2 		$26.4M Sell
31,328
-984
-3% -$803K 0.42% 86
2016
Q1 		$25.9M Sell
32,312
-621
-2% -$465K 0.42% 86
2015
Q4 		$23.9M Buy
32,933
+360
+1% +$276K 0.43% 81
2015
Q3 		$24.3M Sell
32,573
-72
-0.2% -$51.8K 0.45% 74
2015
Q2 		$21.4M Sell
32,645
-3
-0% -$1.99K 0.38% 100
2015
Q1 		$22.3M Sell
32,648
-216
-0.7% -$142K 0.39% 96
2014
Q4 		$20.7M Buy
32,864
+919
+3% +$584K 0.39% 89
2014
Q3 		$20.1M Sell
31,945
-395
-1% -$247K 0.4% 91
2014
Q2 		$19.7M Sell
32,340
-1,196
-4% -$712K 0.38% 98
2014
Q1 		$20.1M Buy
33,536
+1,316
+4% +$768K 0.45% 74
2013
Q4 		$19.4M Buy
32,220
+2,516
+8% +$1.48M 0.45% 74
2013
Q3 		$16.9M Sell
29,704
-2,221
-7% -$1.29M 0.37% 113
2013
Q2 		$18.4M Buy
+31,925
New +$18.6M 0.4% 103

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

Thompson Siegel & Walmsley's WTM Position: Q1 2026 in Review

Thompson Siegel & Walmsley reduced its White Mountains Insurance (WTM) stake by 19% in Q1 2026, selling an estimated $3.68M and leaving 7,209 shares worth $15.8M. The position accounts for 0.28% of the portfolio, ranked #91.

Thompson Siegel & Walmsley first reported a position in WTM in Q2 2013 and has held it in 52 quarters since. The position peaked at $39.6M in Q1 2018. 367 funds tracked by Wall St. Rank hold WTM as of Q1 2026.

  • Thompson Siegel & Walmsley held 7,209 shares of White Mountains Insurance worth $15.8M as of Q1 2026.
  • Thompson Siegel & Walmsley sold 1,718 White Mountains Insurance shares in Q1 2026, an estimated $3.68M.
  • White Mountains Insurance made up 0.28% of Thompson Siegel & Walmsley's portfolio in Q1 2026, its #91 holding.
  • Thompson Siegel & Walmsley first reported a position in White Mountains Insurance in Q2 2013 and has held it in 52 quarters since.
  • Thompson Siegel & Walmsley's White Mountains Insurance position peaked at $39.6M in Q1 2018.
  • 367 funds tracked by Wall St. Rank held White Mountains Insurance as of Q1 2026.

Based on Thompson Siegel & Walmsley's 13F filing for Q1 2026, filed 11 May 2026.