Ken Griffin's position in SPDR S&P MIDCAP 400 ETF Trust - S&P MidCap 400 ETF is currently worth $66.7 Million. That's 0.07% of their equity portfolio (384th largest holding). The first SPDR S&P MIDCAP 400 ETF Trust - S&P MidCap 400 ETF trade was made in Q3 2014. Since then Ken Griffin bought shares 54 more times and sold shares on 52 occasions. The stake costed the investor $51 Million, netting the investor a gain of 31% so far.