Amarillo National Bank decreased its position in shares of iShares Global Clean Energy ETF (NASDAQ:ICLN – Get Rating) by 4.3% during the 1st quarter, according to its most recent filing with the Securities and Exchange Commission. The institutional investor owned 486,687 shares of the company’s stock after selling 21,843 shares during the period. iShares Global Clean Energy ETF comprises 2.0% of Amarillo National Bank’s holdings, making the stock its 12th largest holding. Amarillo National Bank owned approximately 0.