Earlier quoted context omitted.
> An ETF isn’t going to “accidentally” exceed 15% ownership of Twitter. No, but an ETF has a defined investment strategy, and if enough money comes into the ETF, it could potentially trigger this.
Do you think big ETFs just buy shares willy nilly without any due diligence on company charters and bylaws?
ETFs are a different concept, but a good index fund will be structured as an ETF, and it looks like this thread is using "ETF" to mean "index fund"? If so, then the answer to your question is an unambiguous yes.