White Mountains Insurance Group Ltd

Robeco Institutional Asset Management B.V. WTM

Report date

3/31/2026

Quarter

2026 Q1

Filed

4/21/2026

Shares

2,179

Value ($000)

4,787

Weight

0.0%

2018 Q3 - 2026 Q1 (31 filings)

Shares History

History scope: non-option holdings only (PUT/CALL rows excluded).

All 13F Holders	Filing date	Value ($000s)	% of Holdings	Shares	Reporting period
2026 Q1	4/21/2026	4,787	0.0%	2,179	3/31/2026
2025 Q4	1/23/2026	1,295	0.0%	623	12/31/2025
2025 Q3	10/22/2025	28,815	0.0%	17,239	9/30/2025
2025 Q2	7/18/2025	32,003	0.1%	17,822	6/30/2025
2025 Q1	4/23/2025	36,887	0.1%	19,154	3/31/2025
2024 Q4	1/23/2025	37,767	0.1%	19,417	12/31/2024
2024 Q3	10/29/2024	34,460	0.1%	20,316	9/30/2024
2024 Q2	7/23/2024	38,853	0.1%	21,378	6/30/2024
2024 Q1	4/24/2024	53,153	0.1%	29,623	3/31/2024
2023 Q4	2/14/2024	44,834	0.1%	29,790	12/31/2023
2023 Q3	10/24/2023	47,730	0.1%	31,912	9/30/2023
2023 Q2	7/24/2023	43,998	0.1%	31,678	6/30/2023
2023 Q1	5/4/2023	44,310	0.1%	32,167	3/31/2023
2022 Q4	2/7/2023	31,961	0.1%	22,598	12/31/2022
2022 Q3	12/1/2022	12,867	0.0%	9,874	9/30/2022
2022 Q2	12/1/2022	12,847	0.0%	10,309	6/30/2022
2022 Q1	12/1/2022	11,763	0.0%	10,353	3/31/2022
2021 Q4	12/1/2022	12,247	0.0%	12,079	12/31/2021
2021 Q3	12/1/2022	19,375	0.0%	18,112	9/30/2021
2021 Q2	12/1/2022	20,792	0.0%	18,112	6/30/2021
2021 Q1	12/1/2022	24,997	0.1%	22,421	3/31/2021
2020 Q4	12/1/2022	26,779	0.1%	26,763	12/31/2020
2020 Q3	1/19/2021	24,736	0.1%	31,755	9/30/2020
2020 Q2	1/19/2021	33,937	0.1%	38,218	6/30/2020
2020 Q1	1/19/2021	36,461	0.1%	40,069	3/31/2020
2019 Q4	1/19/2021	44,699	0.1%	40,069	12/31/2019
2019 Q3	1/19/2021	43,488	0.2%	40,267	9/30/2019
2019 Q2	1/19/2021	42,092	0.1%	41,209	6/30/2019
2019 Q1	1/19/2021	38,142	0.1%	41,209	3/31/2019
2018 Q4	1/19/2021	25,209	0.1%	29,399	12/31/2018
2018 Q3	1/19/2021	14,556	0.1%	15,556	9/30/2018