Bloom Energy Soars on S&P 500 Inclusion

Bloom Energy (BE) will be added to the S&P 500 before trading begins on September 21, a move driven by index rebalancing. This change mandates that funds tracking the S&P 500 must acquire Bloom Energy shares, creating significant buying pressure. The stock saw an 8% increase in Tuesday trading, bucking a softer market trend.

Simultaneously, The Trade Desk (TTD) is being removed from the S&P 500 and demoted to the S&P SmallCap 600. This unusually steep demotion will cause forced selling of TTD shares. The Trade Desk's stock declined 2% on Tuesday morning.

Bloom Energy's Q2 FY2026 performance set the stage for its inclusion, with revenue climbing 165.5% year-over-year. Product revenue saw a 215% surge as hyperscalers adopted its onsite fuel cell systems for AI factories. The company also expanded its financing framework from $5 billion to $25 billion, supported by firm orders.

The Trade Desk's demotion follows a Q2 FY2026 report where revenue grew only 3%, missing expectations. The advertising platform's stock is already down 63% year-to-date amid macroeconomic pressures and execution missteps. The company has reset leadership and plans a 15% workforce reduction.

The S&P 500 rebalance effective September 21 dictates these stock movements. While Bloom Energy's inclusion provides a mechanical bid, its stock has already gained 210% year-to-date. Peers like Plug Power and FuelCell Energy are not part of this rebalance and do not receive similar flow support.

Investors should note that passive rebalances often concentrate demand and selling into the closing auction the day before and the opening of the effective date. While the rebalance may support Bloom Energy shares, its substantial year-to-date gains suggest a cautious approach to chasing the current move.