Pfizer (PFE) Stock After Hours: What’s Moving Shares After the Dec. 23, 2025 Close—and What to Watch Before Dec. 24’s Open
Pfizer shares closed down 1.31% at $24.88 on December 23 after news that a patient died in a long-term trial of its hemophilia drug Hympavzi. The patient suffered a stroke and brain hemorrhage following minor surgery, according to the European Haemophilia Consortium. Trading volume was lighter than average ahead of the holiday. Pfizer said it is working with investigators and regulators to review the case.