White Mountains Insurance Group, Ltd.

8-K Regulation FD disclosure Jun 5, 2026 8-K Director or officer change; Shareholder vote results May 21, 2026 8-K Entered a material agreement; Took on a direct financial obligation May 15, 2026 10-Q Quarter ended 2026-03-31 May 6, 2026 8-K Results of operations (earnings release) May 6, 2026 8-K Other events Apr 1, 2026 10-K Fiscal year ended 2025-12-31 Feb 27, 2026 8-K Other events Feb 26, 2026 8-K Results of operations (earnings release) Feb 6, 2026 8-K Other events Jan 7, 2026 8-K Completed an acquisition or disposition; Other events Dec 8, 2025 10-Q Quarter ended 2025-09-30 Nov 6, 2025 8-K Results of operations (earnings release) Nov 6, 2025 8-K Entered a material agreement Oct 3, 2025 8-K Other events Sep 3, 2025 8-K Director or officer change Sep 2, 2025 10-Q Quarter ended 2025-06-30 Aug 7, 2025 8-K Results of operations (earnings release) Aug 7, 2025 8-K Other events Jul 18, 2025 8-K Other events Jul 16, 2025 8-K Entered a material agreement Jul 7, 2025 8-K Regulation FD disclosure Jun 6, 2025 8-K Shareholder vote results May 22, 2025 10-Q Quarter ended 2025-03-31 May 7, 2025 8-K Results of operations (earnings release) May 7, 2025 8-K Other events Apr 10, 2025 10-K Fiscal year ended 2024-12-31 Feb 28, 2025 8-K Results of operations (earnings release) Feb 7, 2025 8-K Other events Jan 8, 2025 10-Q Quarter ended 2024-09-30 Nov 6, 2024 8-K Results of operations (earnings release) Nov 6, 2024 10-Q Quarter ended 2024-06-30 Aug 7, 2024 8-K Results of operations (earnings release) Aug 7, 2024 8-K Regulation FD disclosure Jun 7, 2024 8-K Shareholder vote results May 23, 2024 10-Q Quarter ended 2024-03-31 May 9, 2024 8-K Results of operations (earnings release) May 9, 2024 8-K Director or officer change Apr 10, 2024 10-K Fiscal year ended 2023-12-31 Feb 26, 2024 8-K Director or officer change Feb 23, 2024