Every brokerage, every fund manager, uses the Aladdin system because it's free. In the US, firms won't allow you to self-direct your own investments unless you have at least $2.5 Million on deposit, prolly even higher at some shops.
This, and through Uncle Larry's large footprint of "shares under management", he controls share voting through ISS, Institutional Shareholder Services. And this is how so many corporations got "woke" by his pushing of DEI officers through the Boards he clubs to near death to comply.