Ken Griffin acquired 15.9 Million BlackRock Institutional Trust Company N.A. - iShares 20+ Year Treasury Bond ETF shares worth $1.69 Billion. It makes up 1.97% of their stock portfolio and is their biggest holding. The investor owns 66914.44% of the outstanding BlackRock Institutional Trust Company N.A. - iShares 20+ Year Treasury Bond ETF stock. The first BlackRock Institutional Trust Company N.A. - iShares 20+ Year Treasury Bond ETF trade was made in Q2 2014. Since then Ken Griffin bought shares 49 more times and sold shares on 30 occasions. The investor's estimated purchase price is $2.04 Billion, resulting in a loss of 18%.