Quinn Emanuel Urquhart & Sullivan's London office has seen revenues almost double over the last year, as the US firm's burgeoning City base continues its rapid growth since its 2008 launch.

The US firm took in London revenues of approximately £21.8m during the 2011 calendar year, up 75% on the 2010 figure of £12.4m reported in the firm's UK limited liability partnership accounts filed towards the end of last year.

Operating profit for the year stood at approximately £14.8m, up 76% from the figure of £8.4m posted for 2010. The results mean that profits per equity partner (PEP) at the firm's City arm have risen to approximately £2.47m.

The strong London performance comes alongside another year of global growth for the litigation specialist firm, which saw firmwide revenue rise by 31% to $723m (£461m) during 2011.

The global results, which were announced yesterday (30 January), also show net profits increasing by 34% during 2011 to $490m (£313m). Profits per equity partner (PEP) rose by nearly 15%, resulting in a PEP figure of $4.2m (£2.7m), while revenue per lawyer increased by 14% to $1.4m (£893,000).

Firmwide managing partner John Quinn (pictured) said: "Results like these do not just happen. They were the product of a lot of hard work by a lot of people. They reflect the high demand for our services from an extremely well informed, financially sophisticated legal community."

He added: "Obviously, we could not have achieved financial results like these simply billing by the hour. A significant amount of our revenue came from contingent fee and other alternative fee arrangements, both on the plaintiffs and defense side."

The news comes after a period of aggressive growth for Quinn Emanuel, which in October secured a Moscow launch with the hire of litigation partner duo Ivan Marisin and Vasily Kuznetsov from Dechert, while the firm also recently signed up outgoing Novartis GC Thomas Werlen.

Quinn's London office, which opened for business in April 2008, posted turnover of £7.6m for its first full year in the City in 2009, with its operating profit of £5.7m equating to a profit margin of 75%.