The two Fiat separate companies debuted on the Milan stock exchange on Monday, marking an historic day for Italy's car giant, local media reported.
Fiat divided itself into two companies to allow its car and truck businesses to pursue separate development strategies.
The original Fiat Spa group comprises the passenger car operations, while the new company Fiat Industrial controls the trucks and tractors units Iveco as well as CNH Global agricultural machinery and part of Powertrain.
Fiat Industrial closed its first day of trading at 9 euros (12 U.S. dollars), up 3.05 percent on the price established by the Italian stock market and the FTSE, while Fiat Spa climbed to 7,02 euros, up 4.91 percent, with a combined price slightly higher than the old Fiat closing price.
According to analysts, the corporate split could lead to greater integration with the American automaker Chrysler, of which Fiat acquired 20 percent and management control last year.
CEO Sergio Marchionne said Fiat may boost the holding to 51 percent, adding that it was not possible anymore to keep together sectors that have no industrial or economic characteristics in common.
"This is a very important moment for Fiat because it represents both a final destination and a starting point," he said warning that plans to invest some 20 billion euros in Italy over the next five years will only go ahead if workers agree to its drive for accords aimed at boosting efficiency and productivity.
Fiat has recently reached agreements for the creation of new companies, which will take over Fiat's historic Mirafiori plant in Turin as well as its car plant at Pomigliano d'Arco near Naples, with all the main labor unions except one, FIOM.
The Mirafiori deal will be put to the vote of workers this month, but FIOM announced that its members will down tools for eight hours on January 28 against the separate agreements.
