Grant Thornton UK acquires strategy consultancy Fairgrove Partners in first domestic deal since Cinven PE investment
Grant Thornton UK has acquired Fairgrove Partners, a strategic consultancy, in its first domestic acquisition since receiving private equity backing from London-based Cinven in late 2024. The deal adds commercial due diligence and strategy consulting capabilities to Grant Thornton UK's existing deals advisory business, broadening the service offering it can pitch to corporate clients on transactions. Grant Thornton UK, the country's sixth-largest professional services firm, has been in aggressive growth mode since the Cinven investment. Earlier in July it announced the hiring of more than 80 new partners over the preceding six months. The Fairgrove acquisition is the latest move in that expansion, signalling that the firm intends to use PE capital not just for headcount growth but for capability bolt-ons in adjacent advisory markets. The addition of commercial due diligence sits directly within the deals advisory ecosystem: buyers and their lenders routinely commission commercial due diligence alongside financial and legal due diligence in M&A transactions, and a firm that can offer all three streams under one roof has a stronger pitch to mid-market corporate and PE clients. No deal value was disclosed. No legal advisers were named in the source material.
Why this matters
PE-backed professional services firms using acquisition as a growth lever is a distinct trend in the UK mid-market, and Grant Thornton's move illustrates how capital from sponsors like Cinven is being deployed to build integrated advisory platforms rather than simply fund organic partner hires. For law students, the story underlines the competitive dynamic between law firms and the Big Four-adjacent advisory houses: as firms like Grant Thornton build in-house commercial due diligence capability, they encroach on work that has traditionally flowed to law firm-adjacent consultancies. The 'why now' trigger is the Cinven PE capital, which provides both the firepower and the commercial pressure (return expectations) to grow rapidly. Corporate M&A teams at City firms will be watching whether Grant Thornton's expanded platform wins mandates that previously went to standalone boutiques, since that reshapes the referral network.
On the Ground
On a deal like this, a trainee would assist with the SPA (share purchase agreement) schedules, prepare the completion bible, and update the Companies House filing once the acquisition closes. Disclosure letter verification against the due diligence report would also fall within a trainee's remit.
Interview prep
Question you might get
“Why might a PE-backed professional services firm like Grant Thornton prioritise acquiring a strategy consultancy over simply hiring more partners, and what does that mean for law firms competing for the same clients?”
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