Tom Gayner's position in SEI Investments is currently worth $11.6 Million. That's 0.12% of their equity portfolio (91st largest holding). The first SEI Investments trade was made in Q4 2011. Since then Tom Gayner bought shares nineteen more times and sold shares on two occasions. The stake costed the investor $8.54 Million, netting the investor a gain of 36% so far.