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Re:Twitter board adopts poison pill after Musk’s $43B bid to... by thaumasiotes on Friday April 15, 2022 @09:19PM (#31048137)
Index funds do, that's pretty much the definition of an index fund.

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.

Re:Twitter board adopts poison pill after Musk’s $43B bid to... by rosndo on Saturday April 16, 2022 @04:32AM (#31050702)
This is simply incorrect. Index funds still do basic due diligence, they would not trigger this poison pill.