Traders work on the floor of the New York Stock Exchange on June 01, 2023 in New York City.Spencer Platt/GettyUS stocks were mostly lower on Monday, pulling back from last week's record highs.Investors are turning their attention to third-quarter earnings season, with 21% of S&P 500 companies set to report this week.Bank of America said that company executives are striking an optimistic tone on earnings calls.US stocks traded mostly lower on Monday, retreating from last week's record highs.While the Nasdaq 100 rose slightly, the Dow Jones Industrial Average declined by nearly 350 points.