American Express reported earnings of $1.40 per share on revenue of $8.33 billion.
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The world's largest credit card issuer reported an 8.1 percent rise in quarterly profit as customers spent more using the company's credit cards.
Net income rose to $1.48 billion, or $1.40 per share, in the third quarter ended Sept. 30 from $1.37 billion, or $1.25 per share, a year earlier.
Total revenue, net of interest expense, remained nearly unchanged at $8.33 billion.
Analysts had expected the company to report earnings of $1.36 a share on $8.35 billion in revenue, according to a consensus estimate from Thomson Reuters.
Overall consumer credit numbers rose less than expected in August, according to data released last week, suggesting that economic expansion may be happening more slowly than economists had thought. Consumer credit rose only $13.5 billion in August, compared with the $20 billion economists polled by Reuters were expecting. The overall slowdown could have impacted American Express's business in that month as well.
—CNBC.com staff contributed to this report.