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Private equity-backed Unity Advisory hits 120 clients as former Big Four chiefs target rivals

Reported by Cityam
Oct 27, 2026· 3 min read
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Key Takeaways
  • • Unity Advisory, a private equity-backed advisory firm founded in April by former Big Four leaders Marissa Thomas (ex-PwC UK COO and managing partner) and Steve Varley (ex-EY UK and Ireland chairman and managing partner), now has 120 clients, according to City AM.
  • • Warburg Pincus has committed up to $300m (£224.8m) in funding to Unity Advisory, a deal signed in April of the firm's launch year.
  • • The firm serves primarily private equity-backed businesses and private equity firms, alongside some listed companies, and reports winning work from a broad range of competitors.
  • • Unity positions its outcome-based, AI-enabled model against hourly billing, and opened a second office in Manchester to serve the North-West.
  • • Thomas told City AM there is no ongoing litigation with PwC or any Big Four firm, after reports of legal threats from PwC in February.
Summary
Unity Advisory has reached 120 clients within roughly a year of its founding, according to City AM, which interviewed co-founders Marissa Thomas and Steve Varley. The firm took on its first client in November of the prior year after being founded in April. Its client base is concentrated in private equity-backed businesses and private equity firms, with some listed companies also among its clients. Thomas described the firm as "a contender" rather than a challenger, saying it is "winning work from a broad range of competitors."

The firm's early period included reports that PwC sent legal threats in February to senior members who had left the Big Four firm to join Unity. Thomas told City AM that there is "no ongoing litigation or legal battle with PwC, or any of the Big Four," and described the relationships as "appropriately cordial."

Unity's backing comes from Warburg Pincus, which agreed to provide up to $300m (£224.8m) in funding last April. James O'Gara, managing director and partner at Warburg Pincus, told City AM that client demand in the firm's first year had "confirmed our investment thesis that there is a global opportunity for a new and modern advisory firm," and that the success "has exceeded our expectations." Varley said the firm commissioned an independent firm to gauge prospective client sentiment before the deal, and that the backing gave the company more runway than a typical startup.

Strategically, Unity positions itself against the traditional hourly billing model. Varley said the firm favours outcome-based fees, arguing that it can move faster than large legacy firms, which he described as "an oil tanker" compared with Unity's "speedboat." The Mayfair-headquartered firm uses AI and proprietary software to increase client-facing time and reduce administrative work, while retaining human judgement. Thomas said the firm's approach puts talent and expertise at the centre of the model.

Unity recently opened a second office in Manchester, which the company said is intended to extend its advisory reach across the North-West. Thomas cited talent and clients as the two reasons for the northern expansion, noting a growing local book of business and a strong pool of professional services talent in the region.

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Sources

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AlphaMaven summarised this story from the reporting below. Each link opens the original article.

Cityam Private equity-backed Unity Advisory hits 120 clients as former Big Four chiefs target rivals