Merck is trading at $144.94 (-3.30%), with broad risk-off pressure a likely contributor, though no company-specific cause is confirmed.
- On October 22, 2026, rising oil prices amid Iran-related tensions and concerns about returns on heavy AI spending accompanied a wider U.S. market selloff.
- Reported EU approval and positive cancer-vaccine trial news were favorable; healthcare was also reported higher, so the broader backdrop is not a confirmed sole cause.