GERMANY - 2024/02/20: In this photo illustration, the Merck & Co., Inc. logo seen displayed on a ... [+] tablet. (Photo Illustration by Igor Golovniov/SOPA Images/LightRocket via Getty Images)SOPA Images/LightRocket via Getty ImagesMerck stock (NYSE: MRK) has gained over 65% in value since early January 2021 – jumping from levels of $70 then to around $115 now – vs. an increase of about 50% for the S&P 500 over this period. This can primarily be attributed to a significant 50% rise in the company’s revenue ...