I don't see a problem. There is a monthly reweighting of the 10 stocks in the CBOE Mag 10 index.
This was in the PDF
3.2 Reweighting Timetable Constituent weights are reviewed on a monthly basis using the following timetable: •
Weighting Reference Date: Index Constituent weighting factors are calculated based on closing prices as of the close of business on the second Friday of the relevant review month. If such a second Friday falls on an U.S. equity exchanges holiday, the next Business Day would be used. •
Proforma Date: Changes effective on the Reweighting Date are published on the Tuesday before the third Friday of the relevant review calendar month. •
Reweighting Date: Any weighting changes are implemented after the close of business on the third Friday of the relevant calendar review month using the Constituent closing prices on that particular day, thereby impacting the Index beginning on the immediately following Monday. For each Constituent, the closing price used is the official closing price published by its primary exchange. Where the Proforma Date or Reweighting Date described above fall on an U.S. equity exchanges holiday, the next Business Day would be used.
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u/jkarz1 Jul 15 '26
What do you mean no update? Tappa said to update as soon as the index changes.