In the context of the input sentence, determine the relationship between 'iShares' and 'BlackRock'.
Options: original broadcaster, chief executive officer, operator, manufacturer

BlackRock generated a record $17 billion in sustainable iShares ETFs inflows year-to-date, outpacing the $12 billion from all of 2019 as we innovate and expand innovate and expand innovate and expand access to sustainable investment solutions.
operator