CHINA - 2025/12/27: In this photo illustration, a Merck logo is seen displayed on the screen of a tablet. (Photo Illustration by Sheldon Cooper/SOPA Images/LightRocket via Getty Images)SOPA Images/LightRocket via Getty ImagesMerck (MRK)’s stock surged by 41% in the last six months, driven not only by a modest revenue increase but also by a significant profit jump and heightened investor confidence. The factors behind this surge include a remarkable earnings performance, groundbreaking drug approvals, and en ...