Rokstone, the London-based specialty re/insurance MGA that is part of the Aventum Group, announced the launch of its International Casualty Division.
The move marks the latest milestone in Rokstone’s strategic build-out of its casualty portfolio, following the recent launch of dedicated units in the U.S. and UK & Ireland all within a matter of months, including sports and leisure event casualty, U.S. commercial risks, North American excess casualty and the UK/Ireland casualty division.
Across these five new casualty units, the business anticipates generating over US$850 million in GWP within five years, testament to its ambitious global vision and fast-growing underwriting footprint.

Sam Wylie has been appointed portfolio manager of the new division. A highly regarded figure in the market, Wylie joins from Convex where he served as class underwriter for the past five years.
With over 15 years’ specialist experience across international casualty, including senior roles at Tokio Marine Kiln and Marsh, he brings deep technical expertise and a strong track record of profitable growth. Based in the UK, he will join Rokstone upon completing his notice period.
The International Casualty Division will be backed by A-rated Lloyd’s capacity, enabling global underwriting reach and robust long-term security, the company said.
“Our agility allows us to capitalise quickly on market opportunities, and the international casualty space provides meaningful diversification for our global portfolio. It’s a complex and competitive sector, one where only the best underwriters truly thrive,” commented Ian Anson, global CEO of Rokstone, in a statement.
With offices across the UK, Europe, the U.S., Asia, and the Middle East, Rokstone is one of the largest and fastest-growing MGAs in the world. It currently underwrites more than US$1.1 billion in GWP across multiple specialty lines, including property, power generation, marine, aviation, warranty, credit & surety treaty, agriculture, accident & health, construction, contingency, liability, and sports & leisure.
Source: Rokstone
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