Jim Simons's position in MarketAxess Holdings is currently worth $7.25 Million. That's 0.01% of their equity portfolio (1221st largest holding). The first MarketAxess Holdings trade was made in Q2 2013. Since then Jim Simons bought shares seventeen more times and sold shares on eighteen occasions. The stake costed the investor $5.18 Million, netting the investor a gain of 40% so far.