The top three are index funds basically which is not really private equity in the colloquial sense. A lot of people's retirements and savings are held by vanguard, blackrock and state street.
These are not the same firms behind the proposal though. I know some of the funds listed like Blackrock and State Street have supported DEI at least in the past and have been targeted by the far right for that reason.
You can’t restrict the sale of stock, typically, but there are some provisions that can be adopted to make things more resilient. Check out “Poison Pills” on Wikipedia