Jeremy Grantham acquired 1.75M Quest Diagnostics shares worth $315M. That's 0.91% of their equity portfolio (30th largest holding). The investor owns 1.55% of the outstanding Quest Diagnostics stock. The first Quest Diagnostics trade was made in Q1 2013. Since then Jeremy Grantham bought shares seventeen more times and sold shares on sixteen occasions. The stake costed the investor $203M, netting the investor a gain of 55% so far.