BlackRock's fund tracking the Nasdaq-100 index will begin trading Thursday, bringing new competition to a segment long dominated by Invesco's QQQ.

The iShares Nasdaq 100 ETF is set to trade under ticker IQQ and charge an expense ratio of 0.12%, or $12 annually on a $10,000 investment, following a fee-waiver period, the world's largest asset manager said.

The fund joins State Street's newly launched SPDR Portfolio Nasdaq 100 ETF (ticker QNDX) in trying to challenge Invesco's dominance by undercutting it on fees. Invesco has more than half a trillion dollars in assets across QQQ and its cheaper cousin QQQM, which charge 0.18% and 0.15%, respectively.

The launch comes on the same week that SpaceX joins Nasdaq's flagship technology and growth benchmark. Read more about the index's rules for IPO inclusion below: