Guy Carpenter & Company, LLC, is a global risk and reinsurance specialist[1] based in New York with more than 60 offices worldwide.

Placing more than $51 billion in gross premium volume in 2021,[2] Guy Carpenter has grown to become one of the world’s leading reinsurance brokers.

[3] Guy Carpenter (1869–1935)[4] founded the company in 1922 and concluded a merger with MMC founders Henry W. Marsh and Donald R. McLennan about a year later.

In February 2020, Guy Carpenter & Company entered into a multi-year agreement with Karen Clark and Company (KCC) to license its catalogue of natural catastrophe models, analytics and execution software.

[15] Another area is "Cyber insurance",[16][17] working with Symantec to measure "severity and frequency.