Ken Griffin acquired 643k Pediatrix Medical Group shares worth $10.9M. That's 0.01% of their equity portfolio (1287th largest holding). The first Pediatrix Medical Group trade was made in Q2 2013. Since then Ken Griffin bought shares 56 more times and sold shares on 53 occasions. The stake costed the investor $8.4M, netting the investor a gain of 30% so far.