Earlier quoted context omitted.
> If they have discretion... True. But doing so would be a fair amount (by index standards) of overhead and hassle. Plus they'd get endless complaints any time the S&P500 was outperforming the "S&P 499" that they were using. Plus they'd put themselves in the crosshairs of a whole range of activists who wanted them to switch to an "S&P 498", or ...497, or ... - by excluding various other companies the activists didn't…
I'd like to be able to invest in an "index minus certain companies which I choose" fund so that people can exclude companies that they don't like for whatever reason.
Fidelity offers one: https://www.fidelity.com/managed-accounts/separately-managed...
It'd probably take you an afternoon worth of time to research then enact it.