– Share sale brings into effect strategic collaboration agreement

SUZHOU, China, Oct. 12, 2020 /PRNewswire/ — CStone Pharmaceuticals („CStone“, HKEX: 2616) announced today the completion of
the Share Subscription Agreement through which an affiliate of Pfizer Inc. („Pfizer“, NYSE: PFE) subscribed for newly issued CStone shares at approximately US$200
million (equivalent to approximately