Joel Greenblatt acquired 12.1 Thousand Ameren shares worth $913 Thousand. That's 0.01% of their equity portfolio (855th largest holding). The first Ameren trade was made in Q1 2012. Since then Joel Greenblatt bought shares twelve more times and sold shares on ten occasions. The stake costed the investor $862 Thousand, netting the investor a gain of 5.9% so far.