U.S. indices were trading lower Monday for the session as investors weigh continued concerns over the COVID-19 Delta variant, the Federal Reserve's upcoming two-day meeting and a sell-off in some Chinese equities.

• The SPDR S&P 500 ETF Trust (NASDAQ:SPY) fell 1.67% to $434.04
• The Invesco QQQ Trust Series 1 (NASDAQ:QQQ) gained 1.96% to $365.70
• The SPDR Dow Jones Industrial Average ETF Trust (NASDAQ:DIA) fell 1.81% to $339.40

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

Merck & Co., Inc. (NYSE:MRK) was the only gainer for the Dow Jones Monday.

Intel Corporation (NASDAQ:INTC), Walt Disney Co (NYSE:DIS) and Apple Inc (NASDAQ:AAPL) were among the top losers for the Dow Jones.

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