This seems a sensible thing to do. If you change the rules on how things end up on your index, you force everyone using that index to reevaluate it. Your index is now perceived as more volatile (and probably is), and all the finance people need to reevaluate the risk of their index funds and decide if it is now 'growth', 'high growth' or whatever bucket it belongs in based on the new risk profile. And then all the po…
> sensible thing to do is to create a new index with the new rules It depends. Indices aren’t funds. They aren’t meant to balance investor interests. They’re meant to communicate some metric about the market. The S&P tells you how big companies are doing in an index optimized to balance representation against trading cost. So in 2005, float was taken into account for weighting (versus just market cap). This made sens…
This is a big win for many S&P 500 etf holders