The pollsters asked 8,000 Francophone voters in Wallonia and Brussels who they’d voted for.
32.4% of respondents said that they had voted socialist.
The liberals come in second place on 22.3% with the Christian democrats ranked third on 15.1%.
The greens are just behind on 14.7%.
Surprising is the score of the right-leaning People's Party that gained the votes of 4.8% of those questioned.
However, this is still below the 5% it would need to get into parliament.