Ryan Specialty, the Chicago-based specialty insurance firm, announced it has signed a definitive agreement to acquire Castel Underwriting Agencies Ltd. from Arch Financial Holdings (UK) Ltd. and minority shareholders.

Terms of the transaction were not disclosed.

Founded in 2014, Castel is a managing general underwriting (MGU) platform, headquartered in London with additional offices in the Netherlands and Belgium.

Castel consists of 13 unique MGUs, each

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