If legislative elections due next March were held this week, Wilders' Freedom Party (PVV) would pick up 36 out of 150 seats in the lower house of parliament, making it the biggest single political group, it found.

Before the trial began on October 31, the PVV was credited with 27 seats.

During the trial, but before his conviction on Friday, its estimated share rose to 34 seats. It currently has 12 lawmakers.

The new poll data comes from a weekly monitoring by the Maurice de Hond Institute.

It found that Prime Minister Mark Rutte's Liberals would place second with 23 seats, against 40 today, and his junior coalition partners, the Labour Party (PvdA), would gain 10 seats, compared with 35 today.

Wilders was found guilty of discrimination against Moroccans but acquitted of hate speech over remarks he made at an election rally in March 2014.