Comparing units outstanding versus one week ago at the coverage universe of ETFs at ETF Channel, the biggest inflow was seen in the ProShares Ultra Bloomberg Natural Gas, which added 9,100,000 units, or a 23.3% increase week over week. And on a percentage change basis, the ETF with the biggest increase in inflows was the ProShares Ultra VIX Short-Term Futures ETF, which added 3,900,000 units, for a 39.6% increase in outstanding units.