With offices in London, Singapore and Cluj, Romania, the firm employs over 700 staff.

[5] It was ranked 86th in the Sunday Times Tech Track 100 listing for 2011 (81st 2010, 72nd 2009, 44th 2008, 54th 2007, 32nd 2006), a sister listing to the Sunday Times Fast Track 100 for Britain's fastest growing unquoted technology companies,[6] and obtained a listing in the EMEA Deloitte Fast 500 in 2007[7] and 2009.

[8] In 2013, the firm was ranked 112th in the Sunday Times HSBC International Track 200 league table.

[10] In December 2016, the consulting firm Mercer acquired Darwin (formerly Thomsons Online Benefits), which now operates as a wholly owned subsidiary.

[11] In November 2020, Darwin changed company name from Thomsons Online Benefits to Darwin Technologies Ltd.[citation needed] [12] Darwin provides on-demand employee benefits management software for its clients, with over 3m users, from companies including Microsoft, Cisco, Samsung, City and Guilds and NCR Corporation.