Sun Holdings was one of only a handful of high-speed trading firms to enjoy a rise in its European revenues during 2013, as the industry struggled with low volatility and tougher regulation.

Sun Trading International, based in London, reported a 96% increase in its revenues to £36 million for the year ended December 31, 2013, according to accounts recently filed at the UK's Companies House. The firm, which employs around 20 people, increased its pre-tax profits to £12.6 million.