December 22 Rebalance: S&P Index Additions

December 22 Rebalance: S&P Index Additions Stocks joining the S&P 500 and S&P 400 on December 22. Index inclusion forces passive funds to buy shares regardless of price, creating predictable demand. With the announcement on 12/5 and inclusion on 12/22, traders have a window to position ahead of the institutional buying wave.