Burford Capital said on Monday its US litigation portfolio investments generated $61m in gross cash and profits of $36m.The investments, which cost $25m since 2012, delivered a 144% investment on invested capital and 60% internal rate of return.Chief executive Christopher Bogart said: "We are delighted with this substantial result which underscores Burford's ability to deliver successful client solutions and uncorrelated financial returns."We look forward to delivering further successes as our investment portfolio continues to perform and the market for litigation financing continues to expand and evolve."Following the news, shares in Burford closed up 3.74% to 145.75p on Monday.