Halyvourgiki Inc., a Greek steelmaker that says it competes with a client of Citigroup Inc., is suing a Citi unit that it claims published a "malicious" research note on the Athens company.

The research note from Citigroup Global Markets contained "falsehoods" about Halyvourgiki's revenue, market share, and investments, the company said in the lawsuit, which was filed in London in September and released by the court Wednesday. The data was published in 2007 alongside accurate figures about Sidenor SA, a publicly traded Citigroup client that competes with the closely held Halyvourgiki, the lawsuit said.

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