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White Mountains Insurance(WTM) - 2024 Q1 - Quarterly Results

Exhibit 99.1 Ark's combined ratio was 94% in both the first quarter of 2024 and 2023. Ark's combined ratio in the first quarter of 2024 included slight net favorable prior year development compared to three points of net unfavorable prior year development in the first quarter of 2023, primarily due to Winter Storm Elliott. Ark's combined ratio in the first quarter of 2024 and 2023 both included minimal catastrophe losses. Non-catastrophe losses in the first quarter of 2024 included $15 million on a net basi ...