Joel Greenblatt's position in NRG Energy is currently worth $26.6 Million. That's 0.48% of their equity portfolio (18th largest holding). The first NRG Energy trade was made in Q2 2015. Since then Joel Greenblatt bought shares seventeen more times and sold shares on seventeen occasions. The stake costed the investor $9.21 Million, netting the investor a gain of 189% so far.