Jeremy Grantham acquired 1.77 Million Quest Diagnostics shares worth $248 Million. That's 1.36% of their equity portfolio (20th largest holding). The investor owns 1.54% of the outstanding Quest Diagnostics stock. The first Quest Diagnostics trade was made in Q1 2013. Since then Jeremy Grantham bought shares nine more times and sold shares on eleven occasions. The stake costed the investor $191 Million, netting the investor a gain of 30% so far.