US stocks: S&P 500, Nasdaq, close slightly up in cautious start to a heavy earnings week

U.S. stocks saw modest gains as the S&P 500 and Nasdaq eked out small increases in muted trading. Investors are digesting recent record highs and anticipating a busy week with earnings reports, economic data, and the Federal Reserve’s rate decision. Geopolitical tensions in the Middle East also remain a concern.

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