Merck (MRK) Stock After Hours Today: Shares Hit a New 52-Week High on Dec. 24, 2025 — What to Know Before U.S. Markets Reopen
Merck shares closed near $106.45 on Dec. 24, up 1.3%, hitting a new 52-week high in a shortened Christmas Eve session. The stock contributed to the Dow’s advance as U.S. markets posted record closes. Trading volume remained thin after hours. No new corporate news was released, but investors continued to react to last week’s drug-pricing agreement with the Trump administration.