Joel Greenblatt's position in NRG Energy is currently worth $31.6 Million. That's 0.49% of their equity portfolio (15th largest holding). The first NRG Energy trade was made in Q2 2015. Since then Joel Greenblatt bought shares eighteen more times and sold shares on seventeen occasions. The stake costed the investor $9.73 Million, netting the investor a gain of 225% so far.