Ranking of firms according to sales in 2011:1. Granvia Construction, Bratislava (€367.4 million)2. ZIPP Bratislava (€283.4 million)3. Doprastav, Bratislava (€271.5 million)4. Strabag, Bratislava (€175.1 million)5. Skanska SK, Bratislava (€124.9 million)6. Váhostav-SK, Žilina (€122.9 million)7. VUJE, Trnava (€115.9 million)8. Eurovia SK, Košice (€114.9 million)9. TSS Grade, Bratislava (€79.9 million)10. Inžinierske Stavby, Košice (€64.7 million)