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New Mountain Capital to Acquire NSM Insurance Group’s U.S. Commercial Insurance Division

02.26.25

Simpson Thacher is representing New Mountain Capital in its announced acquisition of NSM Insurance Group’s U.S. commercial insurance division. 

The acquisition encompasses NSM's diverse portfolio of 15 market-leading niche insurance programs across Property & Casualty, Accident & Health and Reinsurance — as well as its retail agency, NSM Insurance Brokers. These programs will form a new independent business entity, which will continue to be marketed as NSM until a new brand is established.

The Simpson Thacher Team includes Elizabeth Cooper, Matt Rogers, Jack Larkin and Xavier Grivel (M&A); Ben Persina, Janhvi Barthwal and Emily Linares (Banking and Credit); Greg Grogan and Linda Barrett (Executive Compensation and Employee Benefits); Jamie Talbot, Christian Bond and Chandler Gerard-Reimer (Intellectual Property); Andrew Purcell, Adam Hersch and Roberto Arza (Tax); Steven DeLott (Insurance); Peter Guryan, Kelly Karapetyan and Jamie Logie (Antitrust); Krista McManus and Helene Snyder (Real Estate); and Toby Chun and Deepa Sarkar (Environmental).