American Express Company (AXP) closed at $287.64 on Wednesday, just 3.1% shy of its 52-week high of $296.83. The strong core fundamentals of its business, coupled with its growing focus on Gen-Z and Millennial customer base, are reaping significant rewards and driving sustained growth in revenue and brand loyalty.AXP’s shares have gained 19% in the past six months, outperforming the industry and the S&P 500 Index. Over this time frame, the industry and the S&P 500 Index gained 14.6% and 12.8%, respectively. ...