MRK +61.8%. Eli Lilly +36.1%, Johnson & Johnson +35.7%, AbbVie +12.4%, Abbott −27.6%. Weekly closes, Oct 3, 2025 = 100, log scale.

End-of-day closes (Databento EOD), the last close of each week. The four peers are the largest US-listed companies by market value in MRK’s SEC industry (Pharmaceutical Preparations) with a year of closes. It shows what the closes did; a move here is not a cause, a forecast or a call.