Shares of some top credit card companies are down at 10 a.m.:
American Express Co. fell $.77 or 1.2 percent, to $63.79.
Capital One Financial Corp. fell $.67 or 1.2 percent, to $53.75.
Discover Financial Services fell $.49 or 1.2 percent, to $41.08.
Mastercard fell $1.83 or .3 percent, to $524.84.
Visa Inc. fell $.43 or .3 percent, to $160.08.








