Toyota models appeared 56 times in the top 10 rankings of 30 European markets through four months.
Skoda and Kia tied for No. 2 with 29 appearances for their models and Volkswagen was fourth with 25.
Dacia had 21 placements, Peugeot ended the month with 20 and Hyundai had 19, according to figures from market researcher Dataforce.
The best individual model was the Toyota Corolla with 15 top-10 finishes through four months, with No. 1s in Bulgaria, Finland and Poland.