About Petrosibir Petrosibir (previously Shelton Petroleum) is a Swedish company focused on exploring and developing concessions in Russia. Petrosibir�s Ukrainian operations have been distributed to its shareholders. The company holds licenses in the Russian republics of Bashkiria and Komi. Petrosibir�s 2P oil and gas reserves amount to 35 million barrels of oil equivalent. The Petrosibir share is traded on the OTC-list at beQuoted starting from 17 February 2016 under the symbol PSIB-B.