Comparing units outstanding versus one week ago at the coverage universe of ETFs at ETF Channel, the biggest inflow was seen in the The Financial Select Sector SPDR Fund (XLF), which added 7,050,000 units, or a 0.8% increase week over week. Among the largest underlying components of XLF, in morning trading today Berkshire Hathaway (BRK.B) is up about 0.4%, and JP Morgan Chase (JPM) is up by about 0.3%.

And on a percentage change basis, the ETF with the biggest increase in inflows was the OPTZ ETF (OPTZ), which added 1,000,000 units, for a 40.0% increase in outstanding units.

VIDEO: XLF, OPTZ: Big ETF Inflows

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