| Income Statement | 2026-03-31 | 2025-12-31 | 2025-09-30 | 2025-06-30 |
|---|---|---|---|---|
| Total revenues | 517,800 | 1,603,800 | 864,200 | 689,200 |
| Change in fair value of contingent consideration | 10,000 | 60,650* | 36,100 | NaN |
| Loss and loss adjustment expenses | 207,000 | 101,750* | 258,500 | NaN |
| Acquisition expenses | 102,200 | 106,850* | 111,800 | NaN |
| Cost of sales | 42,700 | 57,600* | 55,300 | NaN |
| Broker commission expenses | 17,200 | -16,150* | 27,000 | NaN |
| Loss and loss adjustment expenses-Operating Segments-Ark Insurance Holdings Limited WMOutrigger Re Segment | NaN | NaN | NaN | 164,000 |
| General and administrative expenses | 144,900 | 370,250* | 176,800 | NaN |
| Broker commission expenses-Operating Segments-Bamboo Ide8Insurance Services LLCSegment | NaN | NaN | NaN | 19,800 |
| Loss and loss adjustment expenses-Operating Segments-Bamboo Ide8Insurance Services LLCSegment | NaN | NaN | NaN | 1,700 |
| Loss and loss adjustment expenses-Corporate Non Segment | NaN | NaN | NaN | 800 |
| Kudu Investment Management LLCSegment-Operating Segments | 7,100 | NaN | NaN | 6,100 |
| Interest expense-Operating Segments-HGGlobal BAMSegment | NaN | NaN | NaN | 4,500 |
| Interest expense-Operating Segments-Bamboo Ide8Insurance Services LLCSegment | NaN | NaN | NaN | 2,900 |
| Interest expense-Operating Segments-Ark Insurance Holdings Limited WMOutrigger Re Segment | NaN | NaN | NaN | 4,300 |
| General and administrative expenses-Operating Segments-Kudu Investment Management LLCSegment | NaN | NaN | NaN | 3,600 |
| General and administrative expenses-Operating Segments-HGGlobal BAMSegment | NaN | NaN | NaN | 1,000 |
| General and administrative expenses-Operating Segments-Bamboo Ide8Insurance Services LLCSegment | NaN | NaN | NaN | 22,600 |
| General and administrative expenses-Operating Segments-Ark Insurance Holdings Limited WMOutrigger Re Segment | NaN | NaN | NaN | 56,500 |
| General and administrative expenses-Corporate Non Segment | NaN | NaN | NaN | 53,800 |
| Acquisition expenses-Operating Segments-HGGlobal BAMSegment | NaN | NaN | NaN | 2,000 |
| Distinguished Partners Segment-Operating Segments | 3,500 | NaN | NaN | NaN |
| Acquisition expenses-Operating Segments-Bamboo Ide8Insurance Services LLCSegment | NaN | NaN | NaN | -600 |
| Bamboo Insurance Services LLCSegment-Operating Segments | 0 | NaN | NaN | NaN |
| Acquisition expenses-Operating Segments-Ark Insurance Holdings Limited WMOutrigger Re Segment | NaN | NaN | NaN | 97,200 |
| Corporate Non Segment | 1,000 | NaN | NaN | NaN |
| Acquisition expenses-Corporate Non Segment | NaN | NaN | NaN | 900 |
| Ark Insurance Holdings Limited Segment-Ark Insurance Holdings Limited WMOutrigger Re Segment-Operating Segments | 4,100 | NaN | NaN | NaN |
| Cost of sales-Corporate Non Segment | NaN | NaN | NaN | 42,400 |
| HGGlobal BAMSegment-HGGlobal Segment-Operating Segments | 3,600 | NaN | NaN | NaN |
| Change in fair value of contingent consideration-Operating Segments-Ark Insurance Holdings Limited WMOutrigger Re Segment | NaN | NaN | NaN | 28,400 |
| Interest expense | 19,300 | 21,850* | 19,900 | NaN |
| Total expenses | 543,300 | 702,800 | 685,400 | 512,700 |
| Pre-tax income (loss) | -25,500 | 901,000 | 178,800 | 176,500 |
| Income tax (expense) benefit | 800 | 87,300 | 17,100 | 12,900 |
| Net income (loss) | -26,300 | 813,700 | 161,700 | 163,600 |
| Net (income) gain attributable to noncontrolling interests | 900 | -22,100 | 47,900 | 40,700 |
| Net income (loss) attributable to white mountainss common shareholders | -27,200 | 835,800 | 113,800 | 122,900 |
| Basic EPS | -12.59 | 332.643 | 44.18 | 47.75 |
| Diluted EPS | -12.59 | 332.643 | 44.18 | 47.75 |
| Basic Average Shares | 2,447,300 | 2,512,600 | 2,542,300 | 2,541,400 |
| Diluted Average Shares | 2,447,300 | 2,512,600 | 2,542,300 | 2,541,400 |
WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)
WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)