Amex Outperforms S&P 500 in Modest Gain
American Express stock closed at $326.21 on the NYSE on September 14, 2026, after a modest gain of 0.5% from the prior session.
The move came on a day when the S&P 500 declined around 0.5%, leaving American Express outperforming the broad US equity benchmark over the session.
The stock's market capitalization stood at approximately $220 billion as of mid-September 2026, based on CompaniesMarketCap data.