A federal judge has dismissed a lawsuit that claimed the investment by Citigroup Inc.'s retirement plans in its own stock was "imprudent" because of the company's exposure to subprime mortgages.

In an order Monday, U.S. District Judge Sidney H. Stein in Manhattan threw out the lawsuit, which was seeking class-action status on behalf of more than 151,000 participants in Citigroup's 401(k) plan and in its much smaller Citibuilder 401(k) plan for Puerto Rico.

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