Seven LB100 firms have more than tripled their revenues over the last decade, according to an analysis of ten years of financial data, with just two firms tripling partner profits over the same period.
Total revenue for the LB100 broke through the £40bn mark last year – almost double the £20.6bn recorded in 2014-15 – fuelled by a decade of mergers, sustained international expansion and steady performance gains among the UK’s top law firms.
So which firms have seen the highest growth rates for turnover, profits and headcount over that period? And what are the factors behind that performance?
Profit per equity partner
One common thread links the top three performers for profit per equity partner growth over the past decade – transatlantic mergers.
Hogan Lovells is the top firm on this metric, with PEP increasing by 225% from 2015 to 2025, rising from £739,000 to £2.4m.
In 2015, the firm was five years into the merger of the UK’s Lovells with US firm Hogan & Hartson, and in the years since has consistently increased its profitability, including a particularly steep hike between 2019-20 and 2021-22, when PEP jumped by more than 50% from £1.18m to £1.81m.
Norton Rose Fulbright is second for PEP growth over the decade, with a 222% increase from £394,000 in 2015 to £1.3m in 2025.
That decade saw Norton Rose Fulbright combine with US firm Chadbourne & Parke in 2017, just four years after the transatlantic combination of Norton Rose with Houston’s Fulbright & Jaworski.
In third is transatlantic pioneer DLA Piper, whose transformative three-way US merger took place much further back, in 2005. While it has not quite tripled PEP over the decade, it is very close – up 195% to just above £2.6m.
Hogan Lovells PEP, 2015-25
Turnover
The firms that have seen the sharpest revenue growth over past decade unsurprisingly include a number that have gone through major mergers since 2015.
Womble Bond Dickinson tops the table for ten-year growth, with turnover increasing by 352% from 2015 to 2025.
This hike is primarily due to the 2017 merger of UK firm Bond Dickinson with US firm Womble Carlyle Sandridge & Rice, a deal which saw it go from a £105m UK firm to a £358.3m transatlantic player.
While the firm has continued to grow, it has done so at a more modest rate, with a 30% increase in revenue from 2020 to 2025, now sitting at £484.1m.
Other firms to have undertaken major mergers over the past decade include Gowling WLG, another strong ten-year performer, with its 227% growth largely down to the 2016 combination of UK firm Wragge Lawrence Graham & Co and Canada’s Gowlings.
Similarly, Eversheds Sutherland has notched a 235% revenue increase over ten years, with the 2017 merger of UK firm Eversheds and US firm Sutherland Asbill & Brennan adding $300m to legacy Eversheds’ £400m revenues. The firm now sits in 10th place in the LB100, with total global revenues of £1.275bn.
Notably, East Anglian firm Birketts is the second-fastest grower for revenues over the past decade, with a 246% increase over the last ten years from £34.9m to £120.7m placing just outside the top 50 in the 2025 table.
The firm has achieved this with consistent strong performance in corporate and real estate, and a steady string of expansions that saw the firm launch in London through its 2020 merger with insurance boutique EC3 Legal, expand into the South East through a merger with Kent and London-based Batchelors in 2023, and expand its Bristol hub into a full-service office in 2024.
Meanwhile, other strong-performing UK nationals include TLT, which has increased its revenue by 199% to £187m over the past decade, and Nottingham’s Freeths, which hit £166.8m last year – an increase of 198% since 2015.
Other UK-heritage firms that have grown on the back of sustained international expansion include Kennedys, up 230% to £429m, Osborne Clarke, up 205% to £460.9m, and Addleshaw Goddard, up 186% to £550.9m.
Womble Bond Dickinson turnover, 2015-25
Headcount
Birketts is also the fastest growing firm for headcount over the past 10 years, with an increase of 183% since 2015, followed by Fieldfisher, which has increased its total lawyer headcount by 153% over the last decade.
Fieldfisher, also ranks third for turnover growth, with fee income up 240% from £113m in 2015 to £385m in 2025.
The decade of growth came after the firm adopted a new strategy in 2016, dubbed ‘‘Our Future Refocused’, centred around technology, energy and natural resources, and finance and financial services.
Since then, it has pursued a range of mergers both in the UK and overseas, including with Birmingham’s Hill Hofstetter, Italian firm Studio Associato Servizi Professionali Integrati, and Chinese boutique JS Partners, all in 2016.
The firm expanded across Europe in 2018, launching in Madrid and Barcelona through a merger with Spanish firm JAUSAS, and also opening offices in Frankfurt and Luxembourg, as well as Belfast.
It followed up with a 2019 merger with Irish firm McDowell Purcell, and opened an office in Berlin in 2022 for its ‘Fieldfisher X’ mass litigation and operations arm.


