Lord Browne to return to stock market after six year absence with £1.5bn listing AKRC, an affiliate of Alaska's sovereign wealth fund, is the largest of the cornerstone investors, promising to invest as much as £250m. Others include KFI, the private equity vehicle run by hedge fund manager Louis Bacon, and the McNair Group, run by Robert McNair, owner of the Houston Texans American football team. Lord Browne and Sir Robert will be among nine non-executive directors on the board. Others will include Pierre Lapeyre and David Leuschen, Riverstone's co-founders, and Tidu Maini, an adviser to the Qatar Foundation Endowment. The aim of the listing - led by Goldman Sachs and JP Morgan - is to give Riverstone a permanent source of funding for its investments. The quoted vehicle will invest alongside Rivestone Holding's Fund V, which has raised $7.7bn. The vehicle will give investors exposure to the energy sector with a focus on exploration and production. The prospectus says that Riverstone expects the fundraising by October 23, with conditional dealings beginning the next day. The vehicle should be eligible for inclusion in the FTSE 250 index at the next reshuffle in December. Separately, the prospectus also for the first time shows the investment Riverstone Holdings has made in Cuadrilla. To date, Riverstone's fund IV has invested $102m, carrying the 44pc stake in its books at a three imes multiple of invested capital, having to date delivered a 56pc internal rate of return.