Costco Wholesale Corp. named Citigroup Inc. and Visa Inc. as its new credit partners, replacing American Express Co. as the exclusive credit-card network at its stores beginning in April of next year.

Citi will become the exclusive issuer of Costco's co-brand credit cards, and Visa will replace American Express as the credit card network for Costco's stores.

Visa shares rose more than 2% premarket, while Citi edged up 0.6%.

Last month AmEx announced the end of the 16-year partnership in which Costco only accepted AmEx cards. The unusual partnership had driven a significant chunk of business to the New York card company. In addition, AmEx and Costco issued a credit card together that could also be used at other merchants.

Citigroup was expected to aggressively pursue the business.

The break with AmEx set up a race among credit-card firms to team up with the fast-expanding wholesale club, which sells everything from car tires to smoked salmon.

AmEx, which issues credit and charge cards and owns a processing network, said it had been unable to reach a new agreement with Costco on terms that "would have made economic sense" for the company.

Write to Angela Chen at angela.chen@dowjones.com

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