Ken Griffin acquired 2.1 Million Rio Tinto plc - ADR shares worth $145 Million. That's 0.15% of their equity portfolio (155th largest holding). The first Rio Tinto plc - ADR trade was made in Q2 2013. Since then Ken Griffin bought shares 48 more times and sold shares on 51 occasions. The stake costed the investor $126 Million, netting the investor a gain of 15% so far.