Burford Capital LLC is getting some serious money from a serious source.

The litigation finance firm Wednesday said it had secured a commitment of up to $667 million from an undisclosed sovereign wealth fund. The publicly traded company also said it had raised $300 million from more traditional investors for a new litigation finance fund.

Burford CEO Christopher Bogart said the money, combined with more than $630 million from the firm's own balance sheet, solidifies the company's long-term capital needs and also proves that some of the world's most sophisticated investors are buying into the idea of betting on lawsuits.