The business has its origins in the share registration business of Lloyds TSB which was bought out from Lloyds by Advent International, a private equity institution, in 2007.[3] The company was the subject of an initial public offering in October 2015.[4] In July 2017 it announced the acquisition of the share registration business of Wells Fargo.[5]
On 30 July 2020, the company announced its intention to rebrand as "EQ".[6] In April 2021 Siris Capital made an offer worth £661 million for the company.[7] The transaction was completed on 10 December 2021.[8]
Members of the PCS trade union, who were working for MyCSP, a wholly-owned subsidiary of Equiniti, and who administered the pensions of around 1.7 million past and present civil servants, began a strike in July 2025 which lasted for almost five months, running until the end of the company's contract. The strike followed the refusal by MyCSP/Equiniti to recognise the union, and their refusal to negotiate with PCS regarding the transfer of both the work and the staff to Capita.[9]
