Smith & Williamson was founded by David Johnstone Smith and Andrew Williamson in Glasgow in 1881. By 1998, the firm had seven office and claimed to be the 12th largest accounting firm in the UK based on fee income. It also acted as an investment manager and private banking house. Smith & Williamson has had a number of mergers. The first merger was with NCL (Securities) Limited, an investment manager, in 2002. Its second merger was with Solomon Hare, a private accounting firm in the UK, in 2005. Nexia Audit Limited was renamed Nexia Smith & Williamson Audit Limited in 2006. In 2018 Smith & Williamson merged with LHM Casey McGrath in
Dublin. In September 2020, the company announced it had completed its merger with the Tilney group. In February 2022 the merged firm Tilney Smith & Williamson, owned by private equity funds
Permira and
Warburg Pincus, was re-branded as Evelyn Partners. Nexia Smith & Williamson Audit Limited was renamed CLA Evelyn Partners Limited. In 2024, the professional services business of
Evelyn Partners was acquired by
Apax Partners LLP and subsequently rebranded as
S&W Group, reviving the Smith & Williamson name the following year. ==Locations==