Fiat's shares rose more than 3 percent on Wednesday as a group led by the Italian car maker readied to buy Chrysler after the U.S. Supreme Court removed the final obstacle to the deal.
At 0716 GMT, the shares were up 3.7 percent at 7.71 euros, more than twice the rise in the DJ Stoxx auto sector.
In a statement, Fiat which is leading a group that includes a union-aligned trust as well as the U.S. and Canadian governments, said it expected to close the deal shortly.
A person familiar with Chrysler's plans told Reuters the deal would close by 1400 GMT.
In a victory for the U.S. administration driving the restructuring of bankrupt Chrysler, the Supreme Court denied a request from Indiana pension funds to delay the sale.