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A Citi sign is seen at the Citigroup stall on the floor of the New York Stock Exchange. The company is said to have suspended one of its top London traders due to sandwich thefts at the company canteen. Reuters/Brendan Mcdermid

Citigroup Inc (C.N) Friday sued AT&T Inc (T.N), saying the phone company infringed its trademarks in the phrase “thankyou” by using the terms “thanks” and “AT&T thanks” in a new customer loyalty program.

The fourth-largest U.S. bank filed its complaint in the U.S. District Court in Manhattan. It seeks a halt to any infringements, triple and punitive damages and other remedies.

AT&T did not immediately respond to requests for comment.

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