Ken Griffin acquired 710 Thousand NRG Energy shares worth $85.5 Million. That's 0.09% of their equity portfolio (302nd largest holding). The first NRG Energy trade was made in Q2 2013. Since then Ken Griffin bought shares 57 more times and sold shares on 54 occasions. The stake costed the investor $28.6 Million, netting the investor a gain of 198% so far.