White Mountains Insurance Group’s specialty P&C re/insurance subsidiary, Ark Insurance Holdings Limited, has renewed Outrigger Re Ltd at a smaller size for business incepting during calendar year 2026, reflecting increased use of traditional quota share reinsurance.
As in 2025, the reinsurance sidecar entered into a quota share with Ark to provide collateralized reinsurance protection on a portion of Ark Bermuda’s global property catastrophe portfolio.
According to Ark, Outrigger deployed $70 million of total investor capital for the 2026 underwriting year, all of which was provided by third-party investors, excluding White Mountains.
As mentioned, the reduction in Outrigger’s size was driven by Ark’s increased reliance on traditional quota share reinsurance for 2026.
In Q3 2025, White Mountains recorded gross written premiums of $366 million and an improved combined ratio of 73% for its Ark/WM Outrigger segment. Net written premiums reached $287 million during the quarter, while net earned premiums grew to $542 million.
Further details on Outrigger Re can be found in the reinsurance sidecar directory of sister publication Artemis, which provides insight into collateralized reinsurance sidecar structures, including launches and renewals by year.
The directory also includes information on sponsors, classes of business, sidecar size, where available, and links to related Artemis coverage.
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