White Mountains Insurance Group Ltd

13F Filings History

Latest 13F report
Q3 2025 - Nov 13, 2025
Value $
$203M
Signature - Title
Michaela J. Hildreth - Managing Director and Chief Accounting Officer
Location
Hanover, NH
Summary
This page shows a list of all the recent 13F filings made by White Mountains Insurance Group Ltd. Form 13F is required to be filed within 45 days of the end of a calendar quarter. White Mountains Insurance Group Ltd reported 1 stock holding with total value $203M as of Q3 2025.

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Holdings Value
Quarter Holdings Value $ Bought Sold Net Top Holdings Form Type Date Filed
Q3 2025 1 $203M $0 $0 MAX 13F-HR 11/13/2025, 08:28 AM
Q2 2025 1 $196M $0 -$121M -$121M MAX 13F-HR 8/11/2025, 04:19 PM
Q1 2025 2 $286M $0 -$93.4M -$93.4M MAX, SPY 13F-HR 5/12/2025, 04:13 PM
Q4 2024 2 $426M $0 $0 SPY, MAX 13F-HR 2/12/2025, 04:23 PM
Q3 2024 2 $543M $0 $0 MAX, SPY 13F-HR 11/12/2024, 04:18 PM
Q2 2024 2 $444M +$50.8M -$65.9M -$15.1M MAX, SPY 13F-HR 8/8/2024, 04:05 PM
Q1 2024 2 $617M $0 $0 MAX, SPY 13F-HR 5/9/2024, 04:39 PM
Q4 2023 2 $393M -$143M -$143M MAX, SPY 13F-HR 2/13/2024, 04:22 PM
Q3 2023 2 $441M -$10.7M -$10.7M SPY, MAX 13F-HR 11/9/2023, 07:15 AM
Q2 2023 2 $508M +$61M -$114M -$53.4M SPY, MAX 13F-HR 8/10/2023, 08:18 AM
Q1 2023 2 $611M SPY, MAX 13F-HR 5/11/2023, 07:35 AM
Q4 2022 2 $502M +$284M +$284M SPY, MAX 13F-HR 2/13/2023, 03:12 PM
Q3 2022 2 $195M +$46.4M +$46.4M MAX, SPY 13F-HR 11/9/2022, 03:10 PM
Q2 2022 1 $167M MAX 13F-HR 8/12/2022, 08:33 AM
Q1 2022 1 $280M MAX 13F-HR 5/12/2022, 04:05 PM
Q4 2021 1 $262M MAX 13F-HR 2/11/2022, 03:06 PM
Q3 2021 1 $316M $0 $0 MAX 13F-HR 11/12/2021, 08:19 AM
Q2 2021 1 $713M $0 $0 MAX 13F-HR 8/12/2021, 04:09 PM
Q1 2021 1 $600M $0 -$127M -$127M MAX 13F-HR 5/14/2021, 08:45 AM
Q4 2020 1 $802M MAX 13F-HR 2/12/2021, 03:12 PM
Q3 2020 13F-NT 11/12/2020, 03:42 PM
Q2 2020 13F-NT 8/12/2020, 04:03 PM
Q1 2020 13F-NT 5/12/2020, 04:06 PM
Q4 2019 13F-NT 2/12/2020, 03:06 PM
Q3 2019 13F-NT 11/12/2019, 03:18 PM
Q2 2019 13F-NT 8/8/2019, 05:09 PM
Q1 2019 13F-NT 5/13/2019, 04:12 PM
Q4 2018 13F-NT 2/13/2019, 03:06 PM
Q3 2018 13F-NT 11/7/2018, 03:08 PM
Q2 2018 13F-NT 8/8/2018, 04:08 PM
Q1 2018 13F-NT 5/10/2018, 04:39 PM
Q4 2017 13F-NT 2/13/2018, 03:13 PM
Q3 2017 13F-NT 11/9/2017, 03:12 PM
Q2 2017 13F-NT 8/10/2017, 04:10 PM
Q1 2017 13F-NT 5/11/2017, 04:27 PM
Q4 2016 13F-NT 2/13/2017, 03:48 PM
Q3 2016 13F-NT 11/10/2016, 02:47 PM
Q2 2016 13F-NT 8/11/2016, 08:02 AM
Q1 2016 13F-NT 5/12/2016, 04:01 PM
Q4 2015 1 $653M SYA 13F-HR 2/16/2016, 07:16 AM
Q3 2015 1 $651M SYA 13F-HR 11/12/2015, 04:12 PM
Q2 2015 1 $497M +$12.4M +$12.4M SYA 13F-HR 8/12/2015, 08:12 AM
Q1 2015 1 $470M SYA 13F-HR 5/14/2015, 08:08 AM
Q4 2014 1 $462M SYA 13F-HR 2/17/2015, 08:02 AM
Q3 2014 1 $468M SYA 13F-HR 11/13/2014, 03:12 PM
Q2 2014 1 $456M SYA 13F-HR 8/8/2014, 07:59 AM
Q1 2014 2 $398M SYA, SIEGY 13F-HR 5/12/2014, 04:19 PM
Q4 2013 2 $381M SYA, SIEGY 13F-HR 2/13/2014, 03:06 PM