Stay informed with free updatesSimply sign up to the Hedge funds myFT Digest -- delivered directly to your inbox.Hedge funds are on a roll again. That’s the main takeaway from Goldman Sachs’ latest review of regulatory filings and their own prime brokerage business.The average US long-short equity hedge fund is up 3 per cent this year, roughly keeping pace with the S&P 500 thanks to the performance of their favourite longs. Goldman’s Hedge Fund VIP basket of stocks that are the most..