Mario Gabelli acquired 16.2 Thousand BlackRock Institutional Trust Company N.A. - iShares S&P Mid-Cap 400 Growth ETF shares worth $1.41 Million. That's 0.01% of their equity portfolio (516th largest holding). The investor owns 54.21% of the outstanding BlackRock Institutional Trust Company N.A. - iShares S&P Mid-Cap 400 Growth ETF stock. Mario Gabelli acquired their 16.2 Thousand shares in Q4 2002. So far they never sold any shares in the company.