The all-time high American Express stock closing price was 150.27 on March 08, 2021. The company also operates a. stock news by MarketWatch. The exchange, at its height, handled about 10% of all amex stock securities. Moreover, over the past month, the stock fell by 1.34%, but in the past year, increased by 47.94% AXP | Complete American Express Co. EDT View Interactive AXP Charts. The company boasts a robust market cap of. $148.53 $1.11 0.8% Price as of April 15, 2021, 8:00 p.m. It is also refered to as NYSE AMEX Equities or the New York Curb Exchange although the latter has not been commonly used since 1953 The latest closing stock price for American Express as of April 14, 2021 is 147.42. The all-time high American Express stock closing price was 150.27 on March 08, 2021. American Stock Exchange (AMEX) The AMEX or the American Stock Exchange is located in New York, NY. A high-level overview of American Express Company (AXP) stock. after the NYSE and the NASDAQ, and handles approximately 10% of all American trades. The American Stock Exchange (AMEX) was once the third-largest stock exchange in the United States, as measured by trading volume.