Bloom Energy, Illumina, and Everpure will enter the S&P 500, while other firms join related S&P indices ahead of the September 21 rebalance
Executive summary: S&P Dow Jones Indices announced that Bloom Energy, Illumina, and Everpure will be added to the S&P 500, while other companies will join the S&P 100, S&P MidCap 400 and S&P SmallCap 600, effective before the market open on September 21, 2026. Index inclusion typically triggers passive fund buying, increases stock visibility, and signals that the companies meet S&P’s market‑cap and liquidity thresholds, which can affect trading volumes and investor perception.
Who is involved: S&P Dow Jones Indices (the index provider), Bloom Energy, Illumina, Everpure, and the unnamed firms slated for the S&P 100, MidCap 400 and SmallCap 600 additions.
Likely next: On September 21, 2026, index‑funds will adjust holdings to reflect the changes, potentially causing short‑term price pressure; the next regular quarterly review will occur in December 2026.
S&P Dow Jones Indices announced that Bloom Energy, Illumina, and Everpure are set to be added to the S&P 500, with additional companies slated for the S&P 100, S&P MidCap 400 and S&P SmallCap 600. The changes will take effect before the market open on Monday, September 21, 2026, to align with the quarterly rebalance cycle. No further details about the specific replacement companies were provided in the release.
Timeline
- — 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 (PR Newswire)
Analysis — what this means
Likely next events
- September 21, 2026: S&P 500 rebalance effective before market open, triggering index‑fund purchases of Bloom Energy, Illumina, and Everpure.
- September 20, 2026: S&P Dow Jones Indices to publish the final constituent list for the September rebalance.
Sectors affected
- Hydrogen fuel‑cell technology (Bloom Energy)
- DNA sequencing and clinical diagnostics (Illumina)
- Water filtration and purification systems (Everpure)
Regulatory implications
- No new regulatory requirements arise from the index changes; inclusion remains governed by S&P’s transparent, rules‑based methodology.
Historical parallels
- Reddit’s addition to the S&P 500 announced August 13, 2026
- Ferguson Enterprises’ addition to the S&P 500 announced July 31, 2026