Ark Insurance Holdings Limited, the specialist property and casualty re/insurance subsidiary of White Mountains Insurance Group, has renewed Outrigger Re Ltd for a smaller unit to commence operations in 2026, reflecting increased use of traditional quota share reinsurance.
Reinsurance Sidecar has a quota share contract with Ark to provide collateralized reinsurance protection for a portion of Ark Bermuda’s global property catastrophe portfolio through 2025.
According to Ark, Outrigger has deployed $70 million in total investor capital in the 2026 underwriting year, all of which was provided by third-party investors, excluding White Mountains.
As mentioned earlier, Outrigger’s reduction in size is due to Ark’s increased reliance on traditional quota share reinsurance through 2026.
In the third quarter of 2025, White Mountains’ Ark/WM Outrigger business generated total written premiums of $366 million, with the combined ratio improving to 73%. Net written premiums for the quarter reached US$287 million, and net premiums earned increased to US$542 million.
For more details on Outrigger Re, see sister publication Artemis’ reinsurance sidecar directory, which provides an in-depth look at mortgage reinsurance sidecar structures, including launches and renewals by year.
The directory also includes information on sponsors, business categories, sidecar dimensions (if available), and links to relevant Artemis coverage.
