Should You Buy Bloom Energy Stock Before It Joins the S&P 500 on Sept. 21?

Bloom Energy joins the S&P 500 on September 21, 2026, with shares trading near $263 after tripling in 2026. While the company shows strong fundamentals with 166% YoY revenue growth, doubled guidance to ~100% growth, and profitability, the analyst cautions that the historical index-entry pop has largely disappeared. At a forward P/E of 53, the stock price already reflects significant growth expectations, and the analyst recommends waiting for a better entry point rather than buying ahead of index fund purchases.