Ken Griffin's position in Quest Diagnostics is currently worth $4.25 Million. That's 0.00% of their equity portfolio (1704th largest holding). The first Quest Diagnostics trade was made in Q2 2013. Since then Ken Griffin bought shares 57 more times and sold shares on 53 occasions. The stake costed the investor $2.95 Million, netting the investor a gain of 44% so far.