S&P Dow Jones Indices announced that SpaceX, OpenAI, and Anthropic will not be added to the S&P 500 in 2026 [1].
The decision highlights a growing tension between traditional index methodology and the rapid rise of massive, privately held technology companies. Because many investors use S&P 500 ETFs to gain passive exposure to the U.S. economy, the exclusion of these high-valuation firms may limit the ability of passive funds to track the most influential companies in the AI and aerospace sectors.
S&P Dow Jones Indices said it will not make special rule changes to fast-track the inclusion of these companies [2]. The index provider said that the firms do not fit the existing methodology and expressed concerns that adding them would further distort the S&P 500 for passive investors [2].
Despite the refusal to change core rules, the index provider is considering a shorter IPO seasoning period [1]. This potential adjustment would reduce the time a company must be publicly traded before becoming eligible for the index, though it does not guarantee inclusion for the three firms in question.
The debate over these exclusions is amplified by the sheer scale of the companies involved. SpaceX, for example, has been discussed in valuation debates as being worth $2 trillion plus [3].
Such valuations create a paradox for index providers. While the companies are economically significant, their lack of public listing or failure to meet specific profitability and liquidity requirements prevents them from entering the index. The S&P 500 remains a benchmark of public equity, and the index provider said it would maintain its standards to ensure stability for the millions of investors who rely on the index for diversified exposure [2].
“S&P Dow Jones Indices announced that SpaceX, OpenAI, and Anthropic will not be added to the S&P 500 in 2026”
This decision underscores the lag between the evolution of the global economy—now driven by private AI giants and aerospace innovators—and the rigid frameworks of legacy financial benchmarks. By prioritizing methodology over the size of a company's valuation, S&P Dow Jones Indices is attempting to prevent extreme volatility in passive portfolios, even if it means the S&P 500 no longer captures the full scope of the most valuable companies in the U.S.
