Joel Greenblatt acquired 17.8 Thousand Aon plc. shares worth $6.3 Million. That's 0.06% of their equity portfolio (418th largest holding). The first Aon plc. trade was made in Q2 2020. Since then Joel Greenblatt bought shares ten more times and sold shares on eight occasions. The stake costed the investor $4.61 Million, netting the investor a gain of 37% so far.