US stocks today: S&P 500 and Nasdaq hit record closing highs as US and Iran agree to extend ceasefire

May 28, 2026

The S&P 500 and Nasdaq hit record closing highs as hopes of a US Iran ceasefire extension boosted sentiment. Investors also digested US inflation rising to a three-year high and weaker GDP revision. AI and tech stocks led gains, with Microsoft, Snowflake, Eli Lilly and Marvell among top movers today.

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