Ken Griffin acquired 1.66 Million Natera shares worth $150 Million. That's 0.15% of their equity portfolio (143rd largest holding). The investor owns 1.29% of the outstanding Natera stock. The first Natera trade was made in Q3 2015. Since then Ken Griffin bought shares 40 more times and sold shares on 25 occasions. The stake costed the investor $95.3 Million, netting the investor a gain of 58% so far.