13F Filings History of WHITE MOUNTAINS INSURANCE GROUP LTD
- Latest 13F filing
- Q1 2026 - 12 May 2026
- Latest reported 13F value
- $313,368,520
- Largest 13F holdings
-
MAX SPY
- Form 13F summary
-
- WHITE MOUNTAINS INSURANCE GROUP LTD Form 13F history summarizes parsed U.S.-listed equity disclosures for this manager.
- Form 13F is generally due within 45 days after each calendar quarter ends.
- WHITE MOUNTAINS INSURANCE GROUP LTD reported 2 equity holdings with a total reported market value of $313,368,520 for Q1 2026.
- Manager signature
- Michaela J. Hildreth - Managing Director and Chief Accounting Officer
- Manager location
- Hanover, NH
13F snapshot
Latest parsed holdings, value, and filing-period context.
1 signal
Manager
Names, identifiers, and filing context for this profile.
2 identity fields
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Holdings Value
Form 13F evidence
Quarterly portfolio filings
SEC-reported 13F quarters for this filer, ordered by the latest accepted filing.
Latest quarter
Q1 2026
Latest value
$313,368,520
Quarter delta
+$51,438,969
Accepted
12 May 2026, 16:01
Rows shown
1-25 of 50
| Quarter | Holdings | SEC-reported value | Bought | Sold | Net | Top Holdings | Form Type | Accepted by SEC |
|---|---|---|---|---|---|---|---|---|
| Q1 2026 | 2 | $313,368,520 | +$118,036,710 | $0 | +$118,036,710 | MAX, SPY | 13F-HR | 12 May 2026, 16:01 |
| Q4 2025 | 2 | $261,929,551 | +$30,686,400 | $0 | +$30,686,400 | MAX, SPY | 13F-HR | 12 Feb 2026, 17:26 |
| Q3 2025 | 1 | $203,208,267 | $0 | $0 | $0 | MAX | 13F-HR | 13 Nov 2025, 08:28 |
| Q2 2025 | 1 | $195,529,923 | $0 | -$120,938,440 | -$120,938,440 | MAX | 13F-HR | 11 Aug 2025, 16:19 |
| Q1 2025 | 2 | $285,933,553 | $0 | -$93,389,601 | -$93,389,601 | MAX, SPY | 13F-HR | 12 May 2025, 16:13 |
| Q4 2024 | 2 | $426,155,380 | $0 | $0 | $0 | SPY, MAX | 13F-HR | 12 Feb 2025, 16:23 |
| Q3 2024 | 2 | $543,217,129 | $0 | $0 | $0 | MAX, SPY | 13F-HR | 12 Nov 2024, 16:18 |
| Q2 2024 | 2 | $443,687,322 | +$50,775,726 | -$65,852,634 | -$15,076,908 | MAX, SPY | 13F-HR | 08 Aug 2024, 16:05 |
| Q1 2024 | 2 | $617,203,048 | $0 | $0 | $0 | MAX, SPY | 13F-HR | 09 May 2024, 16:39 |
| Q4 2023 | 2 | $392,620,178 | $0 | -$142,593,000 | -$142,593,000 | MAX, SPY | 13F-HR | 13 Feb 2024, 16:22 |
| Q3 2023 | 2 | $440,944,652 | $0 | -$10,687,000 | -$10,687,000 | SPY, MAX | 13F-HR | 09 Nov 2023, 07:15 |
| Q2 2023 | 2 | $508,202,687 | +$61,002,373 | -$114,410,568 | -$53,408,195 | SPY, MAX | 13F-HR | 10 Aug 2023, 08:18 |
| Q1 2023 | 2 | $611,136,533 | $0 | $0 | $0 | SPY, MAX | 13F-HR | 11 May 2023, 07:35 |
| Q4 2022 | 2 | $502,393,719 | +$284,124,839 | $0 | +$284,124,839 | SPY, MAX | 13F-HR | 13 Feb 2023, 16:12 |
| Q3 2022 | 2 | $194,658,000 | +$46,433,000 | $0 | +$46,433,000 | MAX, SPY | 13F-HR | 09 Nov 2022, 16:10 |
| Q2 2022 | 1 | $166,859,000 | $0 | $0 | $0 | MAX | 13F-HR | 12 Aug 2022, 08:33 |
| Q1 2022 | 1 | $280,357,000 | $0 | $0 | $0 | MAX | 13F-HR | 12 May 2022, 16:05 |
| Q4 2021 | 1 | $261,554,000 | $0 | $0 | $0 | MAX | 13F-HR | 11 Feb 2022, 16:06 |
| Q3 2021 | 1 | $316,439,000 | $0 | $0 | $0 | MAX | 13F-HR | 12 Nov 2021, 08:19 |
| Q2 2021 | 1 | $713,174,000 | $0 | $0 | $0 | MAX | 13F-HR | 12 Aug 2021, 16:09 |
| Q1 2021 | 1 | $600,184,000 | $0 | -$127,271,760 | -$127,271,760 | MAX | 13F-HR | 14 May 2021, 08:45 |
| Q4 2020 | 1 | $802,193,000 | $0 | $0 | $0 | MAX | 13F-HR | 12 Feb 2021, 16:12 |
| Q3 2020 | 0 | $0 | 13F-NT | 12 Nov 2020, 15:42 | ||||
| Q2 2020 | 0 | $0 | 13F-NT | 12 Aug 2020, 16:03 | ||||
| Q1 2020 | 0 | $0 | 13F-NT | 12 May 2020, 16:06 |