BlackRock filed with the U.S. Securities and Exchange Commission for the iShares Nasdaq-100 ETF under the ticker IQQ. If approved and launched, the fund would track the Nasdaq-100 index and become one of the few U.S.-listed pure Nasdaq-100 ETFs. The filing targets a segment of the $13.7 trillion U.S. ETF market and would mark the first product of its kind in that category not managed by Invesco.