Chief Executive Richard Handler will remain CEO of the brokerage firm and add the same role at Leucadia to his title, while executive committee chairman Brian Friedman will maintain that role and become president of Leucadia.

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U.S. regulators are widening their probe of global interest-rate-rigging by scrutinizing what they claim is a pivotal role of two U.K. brokerage firms in the scandal, people close to the investigation say.

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