Ken Griffin acquired 520 Thousand NRG Energy shares worth $34.7 Million. That's 0.03% of their equity portfolio (595th largest holding). The first NRG Energy trade was made in Q2 2013. Since then Ken Griffin bought shares 52 more times and sold shares on 47 occasions. The stake costed the investor $16.5 Million, netting the investor a gain of 110% so far.