Gazprom Neft (Russian: Газпром Нефть; formerly Sibneft, Russian: Сибнефть) is the third largest oil producer in Russia and ranked third according to refining throughput. It is a subsidiary of Gazprom, which owns about 96% of its shares. The company is registered and headquartered in St. Petersburg after central offices were relocated from Moscow in 2011. By the end of 2012 Gazprom Neft accounted for 10% of oil and gas production and 14.6% of refining activities in Russia. Production volumes in 2012 increased by 4.3% in comparison with 2011, refining throughput grew by 7%, revenue was up 19.
https://en.wikipedia.org/wiki/Gazprom_Neft