The Hampden Group was originally formed in the 1970's by its existing chairman Tim Oliver to bring together various insurance company and syndicate operations in run-off. This business nucleus was gradually expanded during the succeeding decades with a significant increase in turnover when Hampden took on the management of over 350 syndicates on behalf of Equitas.
Hampden then saw opportunities in the amalgamation of various small Members' Agencies and to champion the interests of private capital at Lloyd's. Hampden acquired the Falcon, Aberdeen and Bridge agencies and by 1999 had become the largest Members' Agency.
In 2001, Hampden acquired Nomina Plc, which specialises in the administration and accounting for Members' limited liability vehicles underwriting at Lloyd's. In the same year, Hampden acquired a Dutch insurance company, Sampo Industrial, renamed Hampden Insurance NV.
In 2003, Hampden expanded its investments in the Netherlands through the acquisition of Maas Lloyd, a reinsurance company in run-off.
In 2009, Seymour Taylor a successful accountancy practice was acquired to further bolster the services that could be offered to clients.
In 2014, Hampden announced that it would be a major investor in the newly launched private bank Hampden & Co. which opened for business in June 2015 having raised nearly £50 million with the support of many private investors, Catlin Insurance and a Family Office.
In 2015 capacity contributed by Hampden Members' Agency clients stands at £1,919 million and it continues to be the largest Members' Agency at Lloyd's. In 2016 this increased to £2,048 million.
In 1995, 1996, 1997, 1998, 2006 and 2012, Hampden was included in The Sunday Times Profit Track and The Sunday Times International Track for 2012.