Ken Griffin acquired 567k ProShares Trust - ProShares Ultra QQQ 2x Shares shares worth $55.5M. That's 0.04% of their equity portfolio (586th largest holding). The first ProShares Trust - ProShares Ultra QQQ 2x Shares trade was made in Q1 2014. Since then Ken Griffin bought shares 54 more times and sold shares on 66 occasions. The stake costed the investor $14.2M, netting the investor a gain of 291% so far.