Too many card members are leaving home without them.

That’s the takeaway at American Express Co., whose first-quarter revenue missed analysts’ expectations. Shares were off 46 cents to $64.13; they are up 12 percent year to date.

Card-member spending in the first quarter increased 7 percent, adjusted for foreign-currency translations, marking the fourth successive quarter of single-digit growth after nine quarters of double-digit growth.

Expense accounts have come under greater scrutiny as companies look to cut costs, hurting Amex, which gets more than a quarter of its US billed business from affluent corporate customers.

However, Amex’s billed business gained 6 percent to $224.5 billion and total cards topped 100 million during the quarter. Amex also has the lowest delinquency rate among large credit card companies.