Ken Griffin acquired 8.5 Million BlackRock Institutional Trust Company N.A. - BTC iShares 20+ Year Trea shares worth $957 Million. It makes up 1.42% of their stock portfolio and is their biggest holding. The investor owns 917.99% of the outstanding BlackRock Institutional Trust Company N.A. - BTC iShares 20+ Year Trea stock. The first BlackRock Institutional Trust Company N.A. - BTC iShares 20+ Year Trea trade was made in Q2 2014. Since then Ken Griffin bought shares 45 more times and sold shares on 28 occasions. The investor's estimated purchase price is $1.21 Billion, resulting in a loss of 21%.