Jeremy Grantham acquired 1.64 Million Quest Diagnostics shares worth $221 Million. That's 1.01% of their equity portfolio (26th largest holding). The investor owns 1.43% of the outstanding Quest Diagnostics stock. The first Quest Diagnostics trade was made in Q1 2013. Since then Jeremy Grantham bought shares twelve more times and sold shares on fourteen occasions. The stake costed the investor $180 Million, netting the investor a gain of 23% so far.