Reed Smith's London office revenue increased 13% in 2013, the second successive year of double-digit growth for the Pittsburgh-founded firm's UK outpost.

The City office hit its revenue target of $190m (£113.6m) last year, up from $168m (£100.5m) in 2012, with the energy and natural resources and financial industries groups performing particularly strongly.

Across the 1,800-lawyer firm, turnover growth was more modest at 6%, rising from $1.013bn (£604m) to $1.075bn (£641m).

Profits per partner also grew, rising 5.5% from $1.08m to $1.14m, while revenue per lawyer was flat at $690,000 (£412,000).

"Reed Smith's financial performance was strong in 2013, with our most important economic indicators trending positively," commented global managing partner Sandy Thomas, who took over the top role in October from Greg Jordan.

In London, total partner headcount fell in 2013, though the equity partner ranks grew by four to 62, and associate headcount by 16%.

Meanwhile, Debevoise & Plimpton saw a modest increase in performance, with the New York-headquartered firm posting $688.2m (£410.4m), a 1.9% rise on 2012 takings of $675.4m (£402.9m).

The firm also saw a decrease in fee earner numbers and an 11% uplift in profit per equity partner to $2.31m (£1.38m) on the 2012′s figure of $2.075m (£1.24m).

Debevoise declined to provide a breakdown of its UK revenues for its 18-partner London office.

Earlier this week, Legal Week revealed that Quinn Emanuel's City office recorded its first annual decline in revenue and profit since its 2008 launch, despite firm-wide earnings rocketing to a record high.

Other firms to have posted rises in global revenue include Paul Hastings, McDermott Will & Emery, Dechert, Sidley Austin, Vinson & Elkins, Shearman & Sterling and Latham & Watkins.