For most of the day, stocks struggled for direction amid disappointing earnings from Tyson Foods and Catalent and a short-lived rebound in regional banks.
The struggle for a clearer direction comes after a rally on Friday, when U.S. jobs data pointed to a resilient labor market.
Producer prices, weekly jobless claims and consumer sentiment data are all lined up for the week.
Shares of regional banks tumbled for much of last week on worries tied to the collapse of First Republic Bank.
Warren Buffett's Berkshire Hathaway Inc's Class B shares rose after posting a $35.5 billion first-quarter profit, boosted by gains from stocks such as Apple.