Bloom Energy was just named to the S&P 500. These other stocks are joining the index as well.

By Emily Bary

Molson Coors Beverage, Builders FirstSource and Trade Desk will be getting the boot from the benchmark index

Bloom Energy shares have nearly tripled in 2026 - and now they're set to join the S&P 500.

After getting passed over for several quarters, Bloom Energy is finally getting a spot in the S&P 500.

The maker of fuel-cell technology is one of three companies tabbed to join the benchmark index as part of a quarterly rebalancing. S&P Dow Jones Indices announced the changes after Friday's closing bell. They will take effect before the market opens on Sept. 21.

Bloom Energy (BE) was the largest company eligible for inclusion in the S&P 500 SPX, with a market capitalization north of $74 billion as of Friday's close. Shares rose more than 7% in Friday's regular session, and were up another 7% in after-hours action.

The company has found itself a beneficiary of the artificial-intelligence power craze, and shares have nearly tripled so far this year.

The S&P 500 will also be welcoming Illumina (ILMN), a $33 billion maker of DNA-sequencing technology, and Everpure (P), which is worth $33 billion as well and runs a platform for cloud and data storage.

Shares of Illumina were up 2% in the extended session on Friday, as were shares of Everpure.

In turn, the index committee is removing Molson Coors Beverage (TAP), Builders FirstSource (BLDR) and Trade Desk (TTD) from the S&P 500. Those three companies each have market capitalizations of about $7 billion.

When a large company gets added to the S&P 500, the index committee often removes a smaller company. That size imbalance creates some disruption for an index that is weighted by market capitalization, as it requires selling off some of each of the other 499 index components to account for the fact that the new company requires a bigger weighting than the old one.

But the third-quarter rebalancing also lines up with a general review of all the constituents' float weightings - taking into account whether there have been changes to the number of shares available for public-market investors to trade.

Because of that, you're "already seeing larger trade sizes on a dollar basis," Stephens analyst Melissa Roberts told MarketWatch ahead of the official announcement. That affords the opportunity "to make more changes without it being more impactful to the remaining members."

Roberts previously flagged Cheniere Energy (LNG) and Twilio (TWLO) as leading candidates for inclusion, but they didn't get chosen for this reshuffle. Cheniere's stock was down 4% in Friday's extended trading and Twilio's was off more than 2%.

Some investors like to speculate about potential additions, presuming that stocks tabbed to join the index will get short-term boosts as funds tracking the S&P 500 will be forced to take positions.

The index committee gets to use discretion when selecting new components for the S&P 500. The index is not simply a collection of the 500 largest U.S.-listed companies. Prospective members must meet various requirements around profitability, market capitalization and other elements - but among companies that fulfill those requirements, the committee can choose which make the cut.

There are also opportunities to add or remove components at unscheduled times, such as when a member company gets acquired.

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-Emily Bary

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09-04-26 1746ET