American Express stock closed at $311.39 on the New York Stock Exchange on September 18, 2026, up 0.07% from the prior session.
The S&P 500 index gained 0.17% on the same day, leaving American Express shares slightly trailing the broader market performance.
According to MarketBeat, the stock had traded near $370 at the start of 2026, implying a decline of around 15.8% year-to-date into the September 18 close.
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