Fiat SpA may sell as much as $1.04 billion in shares to reduce debt and gain local investors after the carmaker formed from merging with Chrysler Group LLC lists stock in the U.S., according to Bloomberg News calculations. The company may have as many as 104.2 million shares available for sale when the newly created Fiat Chrysler Automobiles NV starts New York Stock Exchange trading later this year, based on cash-exit rights investors have exercised and earlier plans to dispose of treasury stock.