An unknown buyer acquired 12.3%stake in RTA Laboratuvarlari Biyolojik Urunler Ilac ve Makine Sanayi Ticaret A.S. (IBSE:RTALB) from Resat Ultav on September 25, 2018. An unknown buyer completed the acquisition of 12.3%stake in RTA Laboratuvarlari Biyolojik Urunler Ilac ve Makine Sanayi Ticaret A.S. (IBSE:RTALB) from Resat Ultav on September 25, 2018.