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.