Ken Griffin's position in BlackRock Institutional Trust Company N.A. - iShares Core S&P 500 ETF is currently worth $3.07B. That's 1.99% of their equity portfolio (3rd largest holding). The first BlackRock Institutional Trust Company N.A. - iShares Core S&P 500 ETF trade was made in Q4 2014. Since then Ken Griffin bought shares 48 more times and sold shares on 38 occasions. The stake costed the investor $2.79B, netting the investor a gain of 10% so far.