Fiat SpA secured full ownership of Chrysler Group LLC in a $4.35 billion agreement that will conserve the Italian company’s cash while creating a global carmaker with better scale to take on General Motors Co.

Fiat rose the most in almost five years in Milan trading after Sergio Marchionne, chief executive officer of Chrysler and its Italian parent, struck an accord to buy a 41.5 percent stake from a United Auto Workers retiree health-care trust. The No. 3 U.S. carmaker will put up most of the funding for the transaction, underscoring the CEO’s reputation as a dealmaker.

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