Mario Gabelli acquired 74.1 Thousand SEI Investments shares worth $4.96 Million. That's 0.05% of their equity portfolio (318th largest holding). Mario Gabelli started to build up the position in SEI Investments in Q3 2006 and continued to invest until Q4 2006. Since then they sold 101 Thousand shares. The stake costed the investor $2.21 Million, netting the investor a gain of 125% so far.