In 1996, the company acquired LDG Management Company.
In 1997, the company acquired Managed Group Underwriting.
In 1998, the company acquired Guarantee Insurance Resources.
In 1999, the company acquired Centris Group Inc. (insurance company). The same year, the company also acquired Midwest Stop Loss Underwriters.
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In 2002, the company acquired Dickson Manchester Ltd. and MAG Global Financial Products.
In 2004, the company acquired American Contractors Indemnity Company and RA&MCO Insurance companies.
In 2005, the company acquired US Surety company, DeMontfort Group, Ltd., Perico Ltd., MIC Life Insurance, and the Ilium Insurance Group.
In 2006, the company acquired Novia Underwriters, Inc., G.B. Kenrick & Associates, and the Health Products Division of Allianz Life Insurance.
In 2008, the company acquired Cox Insurance Group, Arrowhead Public Risk, VMGU Insurance Agency, the Surety Company of the Pacific, and MultiNational Underwriters.
In 2009, the company sold its reinsurance brokerage business Rattner MacKenzie Limited and transferred rights relating to brown water marine to its original owner. The company also combined two of its Lloyd's syndicates. The company formed a Property Treaty underwriting team.
In 2010, the company started a Technical Property division.
In 2011, the company opened Primary Casualty and Excess Casualty divisions.
In 2013, the company expanded into the North American construction property risks market and began offering builders risk treaty reinsurance from its London office.
In 2015, the company acquired Producers Ag Insurance Group (ProAg), a writer of crop insurance.
In 2016, the company acquired Bail USA, Inc., a wholesale bail agency and On Call International.
In 2017, the company acquired AIG's Medical Stop-Loss and Organ Transplant operations.
In 2018, the company acquired Qdos Contractor, a provider of insurance products and services to the UK.
In 2019, the company acquired NAS Insurance Services, LLC.
In 2020, the company acquired GCube.
