U.S. indices were trading higher Monday as investors await the Fed's Jackson Hole Economic Policy Symposium this week. FDA approval of Pfizer's (NYSE:PFE) COVID-19 vaccine has also possibly lifted sentiment amid growing COVID-19 concerns.

• The SPDR S&P 500 ETF Trust (NASDAQ:SPY) gained 0.88% to $447.25
• The SPDR Dow Jones Industrial Average ETF Trust (NASDAQ:DIA) gained 0.65% to $353.45
• The Invesco QQQ Trust Series 1 (NASDAQ:QQQ) finished higher by 1.5% to $373.23

Here are the day's winners and losers from the SPY, according to data from Benzinga Pro.

Moderna Inc (NASDAQ:MRNA), Xilinx, Inc. (NASDAQ:XLNX) and Occidental Petroleum Corporation (NYSE:OXY) were among the top gainers for the S&P 500.

Pool Corporation (NASDAQ:POOL), Xcel Energy Inc (NASDAQ:XEL) and Ameren Corp (NYSE:AEE) were among the top losers for the SPY.

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