Jeremy Grantham's position in Merck & Co is currently worth $377 Million. That's 1.82% of their equity portfolio (14th largest holding). The first Merck & Co trade was made in Q1 2013. Since then Jeremy Grantham bought shares twenty more times and sold shares on nineteen occasions. The stake costed the investor $249 Million, netting the investor a gain of 51% so far.