Jim Simons acquired 205 Berkshire Hathaway shares worth $125 Million. That's 0.19% of their equity portfolio (110th largest holding). The first Berkshire Hathaway trade was made in Q3 2013. Since then Jim Simons bought shares nineteen more times and sold shares on sixteen occasions. The stake costed the investor $106 Million, netting the investor a gain of 18% so far.