Jeremy Grantham's position in Merck & Co is currently worth $332 Million. That's 1.72% of their equity portfolio (15th largest holding). The first Merck & Co trade was made in Q1 2013. Since then Jeremy Grantham bought shares nineteen more times and sold shares on eighteen occasions. The stake costed the investor $203 Million, netting the investor a gain of 64% so far.