Bloom Energy, Illumina, and Everpure Set to Join S&P 500; Others to Join S&P 100, S&P MidCap 400, and S&P SmallCap 600
S&P Dow Jones Indices announced a quarterly rebalance affecting the S&P 500, S&P 100, S&P MidCap 400, and S&P SmallCap 600. The changes, effective September 21, 2026, aim to ensure indices accurately reflect current market capitalization ranges.
Why it matters
Index rebalancing impacts institutional investment portfolios and serves as a barometer for the health and composition of the U.S. stock market.
NEW YORK , Sept. 4, 2026 / PRNewswire / -- S&P Dow Jones Indices will make the following changes to the S&P 500, S&P 100, S&P MidCap 400, and S&P SmallCap 600 indices effective prior to the open of trading on Monday, September 21, 2026, to coincide with the quarterly rebalance. The changes ensure that each index is more representative of its market capitalization range. The companies being removed from the S&P SmallCap 600 are no longer representative of the small-cap market space.
Following is a summary of the changes that will take place prior to the open of trading on the effective date:
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