Zymeworks Inc. Common StockFDA decision on zanidatamab expected; approval triggers $250M milestone.
Zymeworks shares climbed nearly 4.0% in pre-market trading as investors positioned themselves ahead of an important U.S. regulatory decision on zanidatamab, expected the following day. The FDA's PDUFA target action date for zanidatamab, a bispecific HER2-targeting antibody developed alongside Jazz Pharmaceuticals, is August 25, 2026, with the regulator reviewing the treatment for first-line HER2-positive locally advanced or metastatic gastroesophageal adenocarcinoma. Approval would immediately trigger a $250 million U.S. regulatory milestone payment, with up to an additional $190 million possible through regulatory milestones in other markets. Citi placed the stock on an upside 90-day catalyst watch earlier in August, while Truist and Wells Fargo have increased their price targets ahead of the PDUFA date. Zymeworks is also pursuing a roughly $929 million all-cash acquisition of Theravance Biopharma, expected to close in the second half of 2026, which would add commercial cash flows from the COPD treatment YUPELRI.
Zymeworks Inc. Common StockFDA decision on zanidatamab expected; approval triggers $250M milestone.
Jazz Pharmaceuticals PLCFDA decision on zanidatamab, co-developed with Jazz, could trigger milestone payments.
Theravance Biopharma IncZymeworks' acquisition of Theravance would add commercial cash flows from YUPELRI.
Truist Financial Corp
Wells Fargo & Company
Citigroup Inc.