PRO SP. Z O.O. acquired 65% stake in MATRX Pharmaceuticals S.A. (WSE:SP1) on March 6, 2018. Post-completion, PRO SP. Z O.O. will hold 65% stake in MATRX Pharmaceuticals S.A. PRO SP. Z O.O. completed the acquisition of 65% stake in MATRX Pharmaceuticals S.A. (WSE:SP1) on March 6, 2018.