$MRK · Merck & Co., Inc.

This filing is an amended SEC Form 3, which is a regulatory ownership report filed by corporate insiders. It was submitted by David R. Maraldo, an executive vice president and president of Merck's MMD unit, to correct information in his original Form 3 filed on May 4, 2026.

The amendment is narrow in scope. It updates the number of Merck common shares Mr. Maraldo is considered to beneficially own through the stock fund of the Merck U.S. Savings Plan, the company's 401(k) plan. As of May 1, 2026, the filing reports 2,870.7727 shares held indirectly through that plan. The filing states that it was submitted solely to correct this share count; no other changes are indicated, and no derivative securities are reported in the amended tables.