Jim Chanos started to build up the position in BlackRock Institutional Trust Company N.A. - iShares 20+ Year Treasury Bond ETF in Q2 2017. Since then they sold 17.3 Thousand shares. The investor sold all their shares in Q3 2017 and doesn't own any shares in BlackRock Institutional Trust Company N.A. - iShares 20+ Year Treasury Bond ETF anymore.