Bloom Energy and Others Joined S&P 500 Index

S&P Dow Jones Indices added three California firms to the S&P 500 and three others to the S&P 100.

Updated on Sept. 28, 2026 in Stock Markets

Bold flat-color editorial illustration of interlocking geometric volumes in navy, cream, and red, representing financial index structure. — S&P Dow Jones Indices added Bloom Energy, Everpure, and Illumina to the S&P 500, with three other California firms joining the S&P 100 in the latest quarterly rebalancing. AI Illustration. Upload story photo >

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Bloom Energy, Everpure, and Illumina have officially joined the S&P 500 following a quarterly rebalancing. Simultaneously, Arista Networks, Palo Alto Networks, and Sandisk were added to the S&P 100 index.

Why it matters

These index additions ensure that the S&P benchmarks remain representative of current market capitalization ranges. Inclusion in these indices often results in increased demand for a company stock, which is expected to boost share prices for the newly added firms.

S&P Dow Jones Indices added three California-based firms to the S&P 500 and three Silicon Valley firms to the S&P 100. These updates ensure the indices maintain accurate representation of market capitalization.

The players

Bloom Energy

This company is based in San Jose and has officially joined the S&P 500.

Everpure

Headquartered in Santa Clara and formerly known as Pure Storage, this firm is now included in the S&P 500.

Illumina

This San Diego-based organization is the third California company added to the S&P 500.

S&P Dow Jones Indices

This entity is responsible for managing and rebalancing the S&P 500 and S&P 100 indices.

The details

The changes were executed prior to the market opening to streamline index tracking. Everpure, which was formerly known as Pure Storage, is among the companies gaining increased visibility through these index adjustments.

September 21, 2026: The index changes became effective before the market open.

Market Dynamics

These additions follow the standard procedure of the S&P 500 quarterly rebalancing process to maintain accurate market tracking. This consistent shift ensures that indices remain aligned with the current leadership in market capitalization.

Individual investors should monitor their portfolio allocations if they hold index-tracking funds that must now adjust their holdings to match the new S&P 500 composition. These index changes can influence trading volumes and provide potential price support for the newly included companies.

The takeaway

Companies added to major indices like the S&P 500 often see heightened investor attention and institutional buying. Shareholders should be aware that quarterly rebalancing events can trigger short-term volatility in both the companies added and those removed from the indices.