The Dow Jones Industrials faltered 62.42 points to 31,438.26.
The S&P 500 dropped 11.63 points to 3,900.11.
The NASDAQ Composite slumped 83.07 points to 11,524.55.
The major averages struggled as investors weighed whether stocks have reached a bottom or are instead briefly rebounding from oversold conditions.
Stocks could get a lift in the near term this week, as investors rebalance their holdings for the end of the quarter.
Etsy was the top decliner in the S&P, down 3.6% following a downgrade by Needham. Shares of Spirit Airlines fell more than 8% after the company said it would accept the latest takeover bid from Frontier Group.
The energy sector was a notable gainer, up 2.8% for the day. Valero Energy climbed 8%, while Devon Energy advanced 7.5%. Marathon Oil added 4.9%.
BioNTech shares also advanced by 7.2% after the drug maker said its Omicron-based Covid-19 booster generates an improved immune response against that variant.
Nike will report earnings for its fiscal fourth quarter after the bell Monday, ahead of a handful of other key reporters this week including Bed Bath & Beyond, General Mills, Constellation Brands and Walgreens.
Treasury prices were lower, raising yields to 3.20% from Friday’s 3.14%. Treasury prices and yields move in opposite directions.
Oil prices improved $2.12 to $109.74 U.S. a barrel.
Gold prices slid six dollars to $1,824.30 U.S. an ounce.