Shares of Bloom Energy surged as speculation mounted that the fuel cell maker is a top candidate for inclusion in the S&P 500 during September's quarterly index rebalance, triggering a buying frenzy that has added roughly 31% to the stock in just five trading days. Bloom Energy Rockets 31% in Five Days on S&P 500 Inclusion Hopes — But Is the Market Pricing In a Certainty That Doesn't Exist?

Shares shifted sharply as traders bid up Bloom Energy on growing expectations that the fuel cell maker will be added to the S&P 500 during September's quarterly rebalance. The stock hit $270.06, up 6.8% on the day and roughly 31% over five sessions, even as broader markets weakened. The rally raises a pointed question: how much of this move reflects genuine business momentum, and how much is a speculative bet on an index committee decision that may not happen?

• Index Funds Would Be Forced to Buy — and That's Driving the Frenzy. Traders are betting the company could be added to the S&P 500 in September's rebalancing, a move that would force index funds to buy the stock and boost demand.

Bloom now meets key index criteria on size, liquidity, and profitability. With a market cap around $69 billion , Bloom is large enough to qualify, but S&P's selection committee exercises discretion — inclusion is never guaranteed, and a disappointment could erase the speculative premium overnight.

• The Numbers Behind the Hype Are Real. Bloom achieved record quarterly revenue of $1.065 billion in Q2 2026, surpassing $1 billion for the first time, with 166% year-over-year revenue growth driven by 215% product revenue growth.

The company raised its full-year 2026 revenue guidance to $3.9B–$4.2B, roughly doubling 2025, with non-GAAP EPS projected at $2.55–$2.85. That explosive trajectory, fueled by AI data centers' insatiable appetite for power, gives the stock a fundamental story beyond the index speculation.

• A $25 Billion AI Power Deal Anchors the Growth Thesis. The rally also rides momentum from Bloom's expanded $25 billion AI-power deal with Brookfield , which finances on-site fuel cell deployments for data centers that can't wait years for grid connections. Falling Treasury yields further help by reducing capital costs for large-scale energy infrastructure deployments.

• Valuation Is Stretched Thin, Even With Explosive Growth. Bloom trades at a trailing P/E ratio of roughly 297 — meaning investors are paying nearly 300 times last year's earnings. Even doubling in value from here would make Bloom one of the most valuable energy companies on the market , a difficult bar to clear. If the S&P committee passes on Bloom this quarter, shareholders could face a swift and painful correction in a stock that has already priced in the best-case scenario.