Alleghany 2021 Full Year Performance Highlights

RSUI - Continued Strong Rate Increases Renewal Rate Change (%) 2% 9% 8% 6% 4% 5% 5% 3% 3% -1% 16% 18% 20% 15% 15% 13% 12% 11% 4% 4% 2018 2019 2020 2021 ■Management Liability (D&O) ■Professional Liability ■General Liability ■Umbrella / Excess ■Property 23

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