[8] Irwin Mitchell continued its expansion in the early 2000s, opening a Newcastle office in 2003[9] as well as acquiring personal injury outfit Lorenzo Zurbrugg that same year.

[12] The next year Irwin Mitchell merged with personal injury and medical negligence firm Alexander Harris, which had offices in London, Solihull and Altrincham.

[16] The following year the firm announced its intention to become an alternative business structure (ABS), in order that it could seek external investment.

[16] This made Irwin Mitchell the nineteenth law firm to convert to an alternative business structure, and the first to do so under a "multi-licence".

[16] Following the approval of the alternative business structure, the firm continued its expansion with a string of acquisitions and office launches over the next three years.

This venture involved a team in the firm's Sheffield office providing legal representation for esure customers who have been injured in motor accidents.

[22] In November 2014 Irwin Mitchell announced the acquisition of Berkeley Law, a boutique firm based in Mayfair.

[24] Later that year Irwin Mitchell merged with Thomas Eggar, acquiring its network of five offices in London and the South East.

The deal created a £250m turnover company[25] and signalled a significant shift in focus, with 50% of the firm's income coming from business and private client work.

[34] IM Asset Management was founded in 2005, and offers financial planning and investment advice services to people who have received personal injury compensation.