Comparing units outstanding versus one week ago at the coverage universe of ETFs at ETF Channel, the biggest inflow was seen in the ProShares Short VIX Short-Term Futures ETF, which added 4,250,000 units, or a 30.9% increase week over week.

And on a percentage change basis, the ETF with the biggest increase in inflows was the SPDR S&P 400 Mid Cap Value ETF, which added 1,900,000 units, for a 33.3% increase in outstanding units. Among the largest underlying components of MDYV, in morning trading today Atmos Energy is up about 0.3%, and Reinsurance Group America is up by about 0.2%.