ETF Flows Report for 05/21/2018 By: ETF Channel May 21, 2018 at 10:49 AM EDT . orttr { font-family: Arial; font-size: 12pt; font-weight: bold; height: 24px; } . Read More >> Related Stocks: Energy Select Sector SPDR S&P Oil & Gas Expl & Prod SPDR Vaneck Oil Services ETF