Jim Simons acquired 205 Berkshire Hathaway shares worth $126 Million. That's 0.19% of their equity portfolio (109th 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 19% so far.