An unknown buyer acquired 17.15% stake in Public Joint Stock Company RN-Western Siberia (MISX:CHGZ) from TOC Investments Corporation Limited on March 27, 2018. An unknown buyer completed the acquisition of 17.15% stake in Public Joint Stock Company RN-Western Siberia (MISX:CHGZ) from TOC Investments Corporation Limited on March 27, 2018.