Henderson logged an underlying profit after tax of £77.4 million for the full year, representing a big rise from 2009’s profit of £14.5 million. The firm said it had seen £2 billion of net inflows.

At Gartmore, earnings before interest, taxation, depreciation and amortisation stayed broadly flat last year, at £55 million, while net revenues fell from £223.7 million the previous year to £208.7 million. Underlying cash earnings, however, rose significantly from £19.5 million to £39.2 million.

UK-listed Henderson announced last month its proposal to buy Gartmore Group; under the terms of the deal, Gartmore shareholders will receive two Henderson shares for every three Gartmore shares.

“We announced, after the year end, our proposed acquisition of Gartmore. This acquisition will reinforce our position as a diversified asset manager… and it will significantly strengthen our presence amongst UK retail investors. We are making good progress and we expect to complete this acquisition in early April,” said Andrew Formica, Henderson’s chief executive.