S&P 500 index rebalance
Bloom Energy, Illumina and Everpure will join the S&P 500 index in September.
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Key Points
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Bloom Energy is classified in the Industrials sector, Everpure in Information Technology, and Illumina in Health Care. Everpure and Illumina are moving up from the S&P MidCap 400, while the three companies leaving the S&P 500 will move into the S&P SmallCap 600.
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Bloom Energy has reported earnings above expectations and raised its full-year guidance; its solid-oxide fuel-cell systems are attracting data-center demand because they can efficiently generate electricity from natural gas. Illumina also raised its annual revenue guidance, citing demand for genomic-sequencing products.
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The S&P 500 comprises 503 companies and represents about 80% of the U.S. equity market by capitalization. It is weighted by free-float market capitalization, so larger constituents have a greater effect on the index’s performance.
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In Friday’s extended trading, Bloom Energy rose 7.5%, Everpure gained 2.2% and Illumina advanced 2%; Builders FirstSource, one of the companies being removed, fell 1.8%.
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The quarterly rebalance also promotes Dell Technologies, Palo Alto Networks, Arista Networks and SanDisk to the S&P 100, replacing Honeywell Aerospace, Nike, Simon Property Group and Colgate-Palmolive.
Bloom Energy, Illumina, and Everpure will join the S&P 500 before trading opens on September 21, 2026, according to S&P Dow Jones Indices. The three companies will replace Molson Coors Beverage, The Trade Desk, and Builders FirstSource. The moves reflect strength in fuel cells, genomic sequencing, and data-storage technology.
The additions sparked immediate gains in extended trading. Bloom Energy rose 7.5%, Illumina advanced 2%, and Everpure gained 2.2% as index-tracking funds began repositioning ahead of the September changes. Builders FirstSource, one of the departing companies, fell 1.8%.
Bloom Energy Riding Wave of Data-Center Demand
Bloom Energy's fuel-cell technology is attracting major interest from data centers seeking efficient power solutions. The company's solid-oxide fuel-cell systems generate electricity from natural gas with minimal waste. Yahoo Finance reported that Bloom Energy recently beat earnings expectations and raised its full-year guidance, cementing investor confidence.
The S&P 500 inclusion will expose Bloom Energy to even broader institutional investment. Index-tracking funds automatically buy stocks added to the index, creating fresh demand. Data centers consume massive amounts of electricity, making Bloom's technology increasingly valuable as computing expands.
Illumina and Everpure Rise From Mid-Cap Ranks
Illumina and Everpure are being promoted from the S&P MidCap 400, reflecting their rapid growth and rising market value. Illumina, which makes genomic-sequencing products, also raised its annual revenue guidance recently. Everpure, classified in Information Technology, operates in the computer-storage sector.
The promotions mark a milestone for both companies. Moving into the S&P 500 signals they have met strict criteria for size, liquidity, and financial health. The S&P 500 tracks 503 companies representing roughly 80% of U.S. equity market value.
Three Companies Drop to Smaller Index Tiers
Molson Coors Beverage, The Trade Desk, and Builders FirstSource will move down to the S&P SmallCap 600. The departures reflect natural rotation as companies' market values shift. S&P Dow Jones Indices conducts quarterly rebalances to keep the index representative of its intended market-capitalization range.
This rebalancing is routine and mechanical — not a judgment on company quality. As markets evolve, companies naturally grow or shrink relative to index thresholds. The three departing companies remain strong businesses; they simply no longer fit the S&P 500's size parameters.
S&P 100 Promotions for Tech and Cybersecurity Leaders
The same rebalance also promotes Dell Technologies, Palo Alto Networks, Arista Networks, and SanDisk to the S&P 100, a smaller index of the largest S&P 500 companies. They replace Honeywell Aerospace, Nike, Simon Property Group, and Colgate-Palmolive. The moves elevate these tech and security companies in prominence.
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