Joel Greenblatt's position in ACI Worldwide is currently worth $2.29 Million. That's 0.02% of their equity portfolio (638th largest holding). The first ACI Worldwide trade was made in Q2 2011. Since then Joel Greenblatt bought shares nineteen more times and sold shares on eighteen occasions. The stake costed the investor $2.15 Million, netting the investor a gain of 6.5% so far.