An unknown buyer acquired 5.62% stake in Zaklady Magnezytowe ROPCZYCE S.A. (WSE:RPC) from ZM Invest S.A. on July 3, 2018. An unknown buyer completed the acquisition of 5.62% stake in Zaklady Magnezytowe ROPCZYCE S.A. (WSE:RPC) from ZM Invest S.A. on July 3, 2018.