Jim Simons acquired 336 Thousand Prothena plc shares worth $8.45 Million. That's 0.01% of their equity portfolio (1010th largest holding). The first Prothena plc trade was made in Q4 2013. Since then Jim Simons bought shares sixteen more times and sold shares on fifteen occasions. The stake costed the investor $7.88 Million, netting the investor a gain of 7.2% so far.