Check your 401(k) or brokerage account... There's a high likelihood you've got some money in a BlackRock fund, since it's the world's largest money manager.
Not Apple's social media arm... iShares is BlackRock's exchange-traded funds unit, and also one of its profit puppies. In addition to the $$$ BlackRock makes from investment advising and lending, it also charges tiny management fees for its ETFs.
Tiny fees (on a large scale) = billions in profit... Big investment firms like Blackrock and Vanguard sell their own ETFs across various brokerages in high volumes. If they charge a 0.03% fee on an ETF, they make only 3 cents off every $100 you invest. But because they operate at such a large scale, those tiny fees can add up to big profits. Blackrock made $800M in profit last quarter on the $6.4T it managed (annualize that, and it's only 0.05% of $6.4T).