Looking at units outstanding versus one week prior within the universe of ETFs covered at ETF Channel, the biggest outflow was seen in the Energy Select Sector SPDR Fund , where 1,750,000 units were destroyed, or a 0.7% decrease week over week. Among the largest underlying components of XLE, in morning trading today Exxon Mobil is down about 0.6%, and Chevron is lower by about 1.5%.