From BofAML:
Hedge funds increased gross exposure to $1.9tn notional as of the beginning of Q2 2015, a 5.1% QoQ increase. Percentage-wise, long exposure stood at 132%, slightly below the Q2 2007 reading of 133%. Short exposure was 55%, much lower than the Q2 2007 reading of 74% (Chart 3). When including ETF positions, gross exposure increases to 201%, compared to 200% last quarter.
Warning: the business cycle is very mature!