White Mountains Insurance Group

Historical 13F Holders

Symbol
WTM
CUSIP
G9618E107
All holders as of
Q2 2026
Type
Equity
Class
COM
Reported Value, Excluding Options
Total Shares Held, Excluding Options
Total Filers

13D/G Filers

Each filer's latest filing for G9618E107 since 12/18/2024, largest first.

Filer % of Class Filed
Vanguard Capital Management LLC 13G 5.2% 4/30/2026
Event 3/31/2026
Under 5%, checked the "5 percent or less" box, or amended by a later filing (3)
Neuberger Berman Group LLC 13G/A
4.9% 5/7/2026
Event 4/30/2026
Morgan Stanley 13G/A 3.0% 2/12/2026
Event 12/31/2025
Vanguard Group Inc 13G/A 0% 3/27/2026
Event 3/13/2026

13F Holders by Quarter

Period Filers Shares, Excl. Options Value, Excl. Options
2026 Q3 191 624 k $1.25B
2026 Q2 359 2.20 M $4.57B
2026 Q1 371 2.21 M $4.85B
2025 Q4 355 2.26 M $4.69B
2025 Q3 340 2.33 M $3.90B
2025 Q2 328 2.32 M $4.16B
2025 Q1 324 2.31 M $4.44B
2024 Q4 326 2.28 M $4.43B
2024 Q3 304 2.25 M $3.78B
2024 Q2 306 2.28 M $4.14B
2024 Q1 304 2.40 M $4.06B
2023 Q4 295 2.27 M $3.42B
2023 Q3 272 2.27 M $3.40B
2023 Q2 257 2.25 M $3.12B
2023 Q1 262 2.24 M $3.09B
2022 Q4 265 2.26 M $3.20B
2022 Q3 254 2.28 M $2.98B
2022 Q2 260 2.66 M $3.32B
2022 Q1 245 2.69 M $3.09B
2021 Q4 244 2.68 M $2.71B
2021 Q3 231 2.67 M $2.86B
2021 Q2 233 2.71 M $3.11B
2021 Q1 245 2.71 M $3.02B
2020 Q4 234 2.70 M $2.71B
2020 Q3 224 2.70 M $2.10B
2020 Q2 209 2.72 M $2.42B
2020 Q1 229 2.74 M $2.49B
2019 Q4 254 2.74 M $3.06B
2019 Q3 250 2.77 M $3.00B
2019 Q2 250 2.80 M $3.27B
2019 Q1 247 2.81 M $2.97B
2018 Q4 244 2.77 M $2.37B
2018 Q3 240 2.78 M $2.60B
2018 Q2 229 2.83 M $2.57B
2018 Q1 232 3.19 M $2.62B
2017 Q4 215 3.12 M $2.65B
2017 Q3 193 3.10 M $2.66B
2017 Q2 205 3.83 M $3.33B
2017 Q1 201 3.84 M $3.38B
2016 Q4 204 3.76 M $3.15B
2016 Q3 190 3.77 M $3.13B
2016 Q2 200 4.16 M $3.50B
2016 Q1 194 4.65 M $3.73B
2015 Q4 194 4.83 M $3.51B
2015 Q3 183 4.92 M $3.67B
2015 Q2 172 5.06 M $3.31B
2015 Q1 174 5.04 M $3.45B
2014 Q4 181 5.03 M $3.17B
2014 Q3 166 5.07 M $3.20B
2014 Q2 180 5.24 M $3.19B
2014 Q1 183 5.15 M $3.09B