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 Filings

13D/G Filers

Investors who own more than 5% of a class must file a Schedule 13D or 13G. 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 Filings Shares, Excl. Options Value, Excl. Options
2026 Q3 30 55.2 k $111 M
2026 Q2 360 7.93 M $4.57 B
2026 Q1 370 2.21 M $4.85 B
2025 Q4 359 2.36 M $4.91 B
2025 Q3 343 2.33 M $3.90 B
2025 Q2 330 2.32 M $4.17 B
2025 Q1 327 2.31 M $4.44 B
2024 Q4 328 2.28 M $4.43 B
2024 Q3 307 2.26 M $3.80 B
2024 Q2 315 2.50 M $4.53 B
2024 Q1 311 2.80 M $4.78 B
2023 Q4 300 2.50 M $3.77 B
2023 Q3 276 2.30 M $3.44 B
2023 Q2 260 2.27 M $3.16 B
2023 Q1 268 2.25 M $3.11 B
2022 Q4 272 2.31 M $3.27 B
2022 Q3 258 2.28 M $2.98 B
2022 Q2 262 2.66 M $3.32 B
2022 Q1 248 2.69 M $3.09 B
2021 Q4 247 2.68 M $2.72 B
2021 Q3 231 2.67 M $2.86 B
2021 Q2 236 2.71 M $3.11 B
2021 Q1 249 2.71 M $3.03 B
2020 Q4 238 2.83 M $2.84 B
2020 Q3 226 2.70 M $2.11 B
2020 Q2 213 2.72 M $2.42 B
2020 Q1 233 2.82 M $2.57 B
2019 Q4 259 2.93 M $3.27 B
2019 Q3 255 2.78 M $3.00 B
2019 Q2 253 2.80 M $3.27 B
2019 Q1 248 2.81 M $2.97 B
2018 Q4 248 2.80 M $2.40 B
2018 Q3 250 2.84 M $2.66 B
2018 Q2 230 2.83 M $2.57 B
2018 Q1 235 3.19 M $2.63 B
2017 Q4 216 3.12 M $2.65 B
2017 Q3 193 3.10 M $2.66 B
2017 Q2 206 3.83 M $3.33 B
2017 Q1 201 3.84 M $3.38 B
2016 Q4 204 3.77 M $3.15 B
2016 Q3 190 3.77 M $3.13 B
2016 Q2 200 4.16 M $3.50 B
2016 Q1 197 4.66 M $3.74 B
2015 Q4 199 4.85 M $3.53 B
2015 Q3 184 4.92 M $3.68 B
2015 Q2 173 5.06 M $3.31 B
2015 Q1 174 5.04 M $3.45 B
2014 Q4 182 5.06 M $3.19 B
2014 Q3 167 5.07 M $3.20 B
2014 Q2 183 5.26 M $3.20 B
2014 Q1 185 5.15 M $3.09 B