American ExpressShares of Dow component American Express ( AXP) slipped 2% to $49.90 on volume of more than 400,000 after the credit card issuer came in a bit short of Wall Street's revenue expectations in its latest quarter. AmEx grew net income by 12% year-over-year to $1.19 billion in the December-ended period from $1.06 billion in the year-ago equivalent quarter. On a per share basis, the company earned $1.01 per share in its fiscal fourth quarter, 3 cents ahead of the average estimate of analysts polled by Thomson Reuters for a profit of 98 cents a share. Revenue net of interest expense came in at $7.74 billion in the quarter vs. the consensus view of $7.92 billion though. That performance was up 7% from last year's equivalent total, reflecting "continued strong growth in cardmember spending and higher travel commissions and fees" but the company also said it experienced a "slight decrease in net interest income that reflected lower yields on the loan portfolio." Based on Thursday's regular-session close at $50.95, AmEx shares are up 10.8% in the past year, but its 52-week high of $53.80 dates back to July 7.