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by a3c9 19 days ago
That's exactly what happened with Nortel in the dotcom crash. Everyone's pension and retirement tied up in a company that couldn't turn a profit and was, at its peak, 38% of the TSE300.

I don't think dominating an index to anywhere close to that degree is likely here, but I wouldn't be surprised to see some similar strategies being used. Changing the rules is already from the Nortel playbook: The Nortel Rule allowed index funds to have over 10% of their holdings in a single stock.