The four international banks had been charged for allegedly helping the Italian food group mislead investors.
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An Italian prosecutor had asked earlier this year that they should be fined and that about 120 million euros ($173.5 million) of their profit should be impounded.
The four banks had repeatedly denied any wrongdoing.
Parmalat, known for its long-life milk, buckled in December 2003 under a 14 billion euro hole in its accounts. Its demise wiped out the savings of more than 100,000 retail investors who had bought the group's investment-grade corporate bonds.
(Reporting by Manuela D'Alessandro, Writing by Lisa Jucca)