Claim: Overgas Inc. is the biggest private gas company managed by Sasho Dontchev, that search for oil and gas near the Provadia and is founded in 1991 in Bulgaria
Evidence: AD is the biggest private gas company in Bulgaria. Its executive director is Sasho Dontchev. 1991 Sofia, Bulgaria In partnership with the British-based JKX Oil & Gas and with the Bulgaria-based Balkan Explorers the company search for oil and gas near the Provadia.