The industry indices of the exchanges are decided upon by a committee of the exchange made up of members of that exchange. The proceedings of their discussions which impacts huge trading is sealed under secrecy in Canada. Secrecy that is from anyone but the members who are also members of the exchange. In some cases, trading members. That is the index game.
The members of the exchange on the index committee decide on what companies are added to their gold index. The members of the exchange on the index committee decide on what companies are deleted from the gold index. The proceeding of these meetings are sealed under secrecy.
If a company is dropped by secret decision of the members of the exchange on the index committee then all the following (tracking) funds have to sell on the same day. Since a tracking fund must track it cannot buy or sell early or late. If the tracking fund did then it would not be tracking for those early execution days in violation of its prospectus. ...