Berwin Leighton Paisner (BLP) and Bryan Cave have agreed to merge following a vote by partners to create a 1,600-lawyer transatlantic firm that will be among the 50 largest in the world, with combined revenues of around $900m (£640m).

The new firm, which will be called Bryan Cave Leighton Paisner, will be fully financially integrated, the firms said in a joint press release, suggesting they were able to overcome tax issues that had pushed back a vote on a proposed merger initially unveiled in mid-October.