# White Mountains Insurance Group Ltd: filings

WTM · NYSE · CIK 776867 · [Financials](/sectors/financials.md) · fiscal year ends Dec 31

Pages: [Overview](/companies/wtm.md) · [Financials](/companies/wtm/financials.md) · [Filings](/companies/wtm/filings.md) · [Insiders](/companies/wtm/insiders.md)

## Reports and events: 310 filings

Newest first, by EDGAR acceptance time (Eastern). Filter with ?form= one of: `periodic`, `8-K`, `10-K`, `10-Q`, `4`, `proxy`, `13dg`, `all`, or any form this company filed (4 476, 8-K 206, SC 13G/A 63, 10-Q 53, 13F-HR 50, 3 23, SC TO-I/A 22, 13F-NT 21, 11-K 20, 10-K 18, DEF 14A 18, SC 13G 16, 5 13, ARS 12, S-8 POS 12, CORRESP 11, UPLOAD 11, SC TO-I 7, SC 13D/A 6, SC TO-C 5, 8-K/A 4, 4/A 3, DEFA14A 3, N-PX 3, SCHEDULE 13G/A 3, 10-K/A 2, DEFR14A 2, SCHEDULE 13D/A 2, SCHEDULE 13G 2, SC TO-T/A 2, 3/A 1, S-8 1, SC 13D 1, SC TO-T 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-08-27 | 08:11 ET | [8-K](/filings/0001628280-26-059191.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001628280-26-059191 |
| 2026-08-06 | 08:50 ET | [10-Q](/filings/0001628280-26-053932.md) | Quarterly report, period 2026-06-30 | 0001628280-26-053932 |
| 2026-08-06 | 08:14 ET | [8-K](/filings/0001628280-26-053913.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001628280-26-053913 |
| 2026-06-05 | 08:17 ET | [8-K](/filings/0001628280-26-041051.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001628280-26-041051 |
| 2026-05-21 | 16:21 ET | [8-K](/filings/0001628280-26-037284.md) | 5.02 Departure or appointment of officers or directors; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001628280-26-037284 |
| 2026-05-15 | 09:02 ET | [8-K](/filings/0001628280-26-035349.md) | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001628280-26-035349 |
| 2026-05-06 | 08:31 ET | [10-Q](/filings/0001628280-26-030935.md) | Quarterly report, period 2026-03-31 | 0001628280-26-030935 |
| 2026-05-06 | 08:20 ET | [8-K](/filings/0001628280-26-030930.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001628280-26-030930 |
| 2026-05-01 | 17:30 ET | [SCHEDULE 13D/A](/filings/0000950157-26-000566.md) | Ownership report, active investor, amended | 0000950157-26-000566 |
| 2026-04-01 | 16:21 ET | [8-K](/filings/0001628280-26-022818.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001628280-26-022818 |
| 2026-04-01 | 16:00 ET | [DEF 14A](/filings/0001104659-26-038487.md) | Proxy statement, period 2026-05-21 | 0001104659-26-038487 |
| 2026-02-27 | 09:21 ET | [10-K](/filings/0001628280-26-012603.md) | Annual report, period 2025-12-31 | 0001628280-26-012603 |
| 2026-02-26 | 17:19 ET | [8-K](/filings/0001628280-26-012417.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001628280-26-012417 |
| 2026-02-06 | 08:21 ET | [8-K](/filings/0001628280-26-005947.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001628280-26-005947 |
| 2026-01-07 | 08:02 ET | [8-K](/filings/0001628280-26-001102.md) | 8.01 Other events | 0001628280-26-001102 |
| 2025-12-08 | 08:10 ET | [8-K](/filings/0001628280-25-055702.md) | 2.01 Completion of an acquisition or disposition; 8.01 Other events; 9.01 Financial statements and exhibits | 0001628280-25-055702 |
| 2025-11-06 | 09:07 ET | [10-Q](/filings/0001628280-25-049910.md) | Quarterly report, period 2025-09-30 | 0001628280-25-049910 |
| 2025-11-06 | 08:18 ET | [8-K](/filings/0001628280-25-049888.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001628280-25-049888 |
| 2025-10-03 | 16:20 ET | [8-K](/filings/0001628280-25-044062.md) | 1.01 Entry into a material agreement; 9.01 Financial statements and exhibits | 0001628280-25-044062 |
| 2025-09-03 | 08:06 ET | [8-K](/filings/0000776867-25-000016.md) | 8.01 Other events | 0000776867-25-000016 |
| 2025-09-02 | 08:19 ET | [8-K](/filings/0000776867-25-000015.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000776867-25-000015 |
| 2025-08-08 | 16:22 ET | [SCHEDULE 13D/A](/filings/0000950157-25-000649.md) | Ownership report, active investor, amended | 0000950157-25-000649 |
| 2025-08-07 | 08:28 ET | [10-Q](/filings/0000776867-25-000014.md) | Quarterly report, period 2025-06-30 | 0000776867-25-000014 |
| 2025-08-07 | 08:03 ET | [8-K](/filings/0000776867-25-000013.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000776867-25-000013 |
| 2025-07-18 | 09:25 ET | [8-K](/filings/0000776867-25-000012.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000776867-25-000012 |
| 2025-07-16 | 16:29 ET | [8-K](/filings/0000776867-25-000011.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000776867-25-000011 |
| 2025-07-07 | 08:58 ET | [8-K](/filings/0000776867-25-000009.md) | 1.01 Entry into a material agreement; 9.01 Financial statements and exhibits | 0000776867-25-000009 |
| 2025-06-06 | 07:59 ET | [8-K](/filings/0000776867-25-000008.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000776867-25-000008 |
| 2025-05-22 | 16:18 ET | [8-K](/filings/0000776867-25-000007.md) | 5.07 Shareholder vote results | 0000776867-25-000007 |
| 2025-05-07 | 08:16 ET | [10-Q](/filings/0000776867-25-000006.md) | Quarterly report, period 2025-03-31 | 0000776867-25-000006 |
| 2025-05-07 | 08:14 ET | [8-K](/filings/0000776867-25-000005.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000776867-25-000005 |
| 2025-04-10 | 08:02 ET | [8-K](/filings/0000776867-25-000004.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000776867-25-000004 |
| 2025-04-02 | 16:01 ET | [DEF 14A](/filings/0001104659-25-031124.md) | Proxy statement, period 2025-05-22 | 0001104659-25-031124 |
| 2025-02-28 | 08:47 ET | [10-K](/filings/0000776867-25-000003.md) | Annual report, period 2024-12-31 | 0000776867-25-000003 |
| 2025-02-07 | 08:12 ET | [8-K](/filings/0000776867-25-000002.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000776867-25-000002 |
| 2025-01-08 | 08:06 ET | [8-K](/filings/0000776867-25-000001.md) | 8.01 Other events | 0000776867-25-000001 |
| 2024-11-06 | 08:17 ET | [10-Q](/filings/0000776867-24-000019.md) | Quarterly report, period 2024-09-30 | 0000776867-24-000019 |
| 2024-11-06 | 08:09 ET | [8-K](/filings/0000776867-24-000018.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000776867-24-000018 |
| 2024-08-07 | 08:48 ET | [10-Q](/filings/0000776867-24-000015.md) | Quarterly report, period 2024-06-30 | 0000776867-24-000015 |
| 2024-08-07 | 08:26 ET | [8-K](/filings/0000776867-24-000014.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000776867-24-000014 |
| 2024-06-07 | 08:06 ET | [8-K](/filings/0000776867-24-000013.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000776867-24-000013 |
| 2024-05-23 | 16:08 ET | [8-K](/filings/0000776867-24-000011.md) | 5.07 Shareholder vote results | 0000776867-24-000011 |
| 2024-05-09 | 19:44 ET | [SC 13D/A](/filings/0000950157-24-000731.md) | Ownership report, active investor, amended | 0000950157-24-000731 |
| 2024-05-09 | 16:17 ET | [10-Q](/filings/0000776867-24-000010.md) | Quarterly report, period 2024-03-31 | 0000776867-24-000010 |
| 2024-05-09 | 16:13 ET | [8-K](/filings/0000776867-24-000009.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000776867-24-000009 |
| 2024-05-03 | 17:10 ET | [SC 13D/A](/filings/0000776867-24-000008.md) | Ownership report, active investor, amended | 0000776867-24-000008 |
| 2024-04-10 | 16:10 ET | [8-K](/filings/0000776867-24-000006.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000776867-24-000006 |
| 2024-04-04 | 06:04 ET | [DEF 14A](/filings/0001104659-24-043314.md) | Proxy statement, period 2024-05-23 | 0001104659-24-043314 |
| 2024-02-26 | 08:58 ET | [10-K](/filings/0000776867-24-000005.md) | Annual report, period 2023-12-31 | 0000776867-24-000005 |
| 2024-02-23 | 08:19 ET | [8-K](/filings/0000776867-24-000004.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000776867-24-000004 |

Page 1 of 7. [Older](/companies/wtm/filings.md?page=2)
Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 30, 2026, 21:03 ET. No prices; not investment advice.