Joel Greenblatt acquired 7.29 Thousand Aon plc. shares worth $2.25 Million. That's 0.04% of their equity portfolio (553rd largest holding). The first Aon plc. trade was made in Q2 2020. Since then Joel Greenblatt bought shares seven more times and sold shares on seven occasions. The stake costed the investor $1.75 Million, netting the investor a gain of 29% so far.