George Sorose just increased his short position on the S&P 500 in a big way. Profit taking will hit the high flyers the most. Just my opinion.
That's more than Amazon, Google, and Apple. Sales growth is only projected at 6% and you know that's a stretch in this economy.
Visa and MasterCard are both up over 400% each in the same 5 years, and they have a much higher PE ratio. AXP just has a better business model. AXP was $65 before the great recession in May of 2007.