By Robin Sidel 

American Express Co. Chief Executive Kenneth Chenault said the company plans to seek a stay of a judge's recent ruling that could ultimately permit merchants to steer consumers to cheaper cards from Visa Inc. and MasterCard Inc.

In an investor meeting, Mr. Chenault also defended the company's decision to fight an antitrust lawsuit filed by the Justice Department in 2010 that led to the judge's ruling last month. The federal judge determined that AmEx's rules for merchants violate antitrust laws.

"Fighting this suit was the right call in 2010 and continuing to fight is the right call now," Mr. Chenault said.

AmEx, which had previously said it would appeal the ruling, will begin the appeals process after the judge sets a remedy in the case, Mr. Chenault said. Although the judge sided with the government in the case, he didn't lay out a remedy at the time of the ruling.

Both sides filed their proposals for a remedy earlier this week.

Mr. Chenault and AmEx President Ed Gilligan declined to specify how the company plans to make up for the loss of spending and lending when its 16-year-old relationship with Costco Wholesale Corp. expires next year. The warehouse giant recently said it wasn't renewing the relationship in which AmEx is the only credit card accepted at Costco stores.

Some 70% of spending on AmEx's co-branded Costco cards takes place outside of the warehouse stores, meaning AmEx will be under pressure to shift those cardholders to its other products when the relationship ends.

"Our intent is to provide these customers with high-value proprietary products that meet their spending needs," Mr. Chenault said. He also said the company will shift investment money that would have been spent on the Costco partnership into other areas that will provide higher returns, although he wasn't specific.

Mr. Chenault added AmEx intends to compete aggressively on other co-branded partnerships that are expected to come up for renewal in the next 18 months. It isn't clear, however, if any new partnerships would provide AmEx with the exclusive acceptance it now has with Costco.

Shares of AmEx were down 90 cents, or 1.1%, to $80.47 in afternoon trading as the meeting continued.

Write to Robin Sidel at robin.sidel@wsj.com

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