Investors have increasingly focused on the potential implications of large private companies—such as SpaceX, OpenAI, and Anthropic—eventually entering public equity indexes and, by extension, passive exchange-traded funds. Given the scale, visibility, and thematic relevance of these companies across artificial intelligence, space, and next-generation technology, this attention is warranted. However, the more relevant consideration for portfolio exposure is not headline private-market valuation alone, but the float-adjusted market capitalization that would be eligible for index inclusion.
This distinction is important. At the time of an initial public offering, a relatively limited portion of shares may be freely tradable, particularly for large companies with significant founder, insider, employee, or strategic-investor ownership. Russell and other index providers generally evaluate index eligibility and weighting based on the publicly available float rather than total enterprise or equity valuation. Consequently, a company with a substantial headline valuation could initially represent a considerably smaller weight in an index than its total valuation might imply.
The estimates below are intended to illustrate the magnitude of this effect. Although the assumed IPO valuations are significant, the corresponding float-adjusted market capitalizations—and therefore the estimated initial index weights—are materially lower because only a limited percentage of shares may be available for public trading at the time of inclusion. Please note these are my estimations based on publicly available third party reports, estimates and surveys. Both Anthropic and OpenAI have filed their registration statements (S-1)“confidentially” which limits investor access to information pre-IPO. SpaceX has filed an S-1 which can be accessed by all via www.sec.gov. I would recommend taking a look if only to marvel at the photographs of space exploration accompanying the filing.
At the portfolio level, the impact would depend on both the aggregate index weight assigned to these companies and the portfolio’s allocation to growth-oriented passive strategies, such as iShares Russell 1000 Growth ETF (IWF). For example, a 0.5% position in SpaceX (the largest projected) within a passive ETF that represents 20% of a portfolio would translate to approximately 0.1% total portfolio exposure. We note that Russell has suggested that they will potentially change their rules to include these companies in their indexes because of their size. S&P has suggested that they will not change their rules and that the companies currently cannot be added to the S&P 500 until they are profitable
In summary, these companies could become meaningful constituents of growth-oriented benchmarks over time, dependent on the changing market conditions and other factors outside investor control. Nevertheless, their initial effect on passive ETF exposure may be more limited than headline valuations suggest. The principal variables to monitor are the amount of publicly available float at the time of inclusion, the pace at which that float expands, and the extent to which client portfolios are allocated to growth-oriented index products. Accordingly, this development merits ongoing attention, but should be evaluated through the lens of float-adjusted exposure rather than total private-market valuation.
Sources: Bloomberg, CNBC, Forbes, Inc, Reuters, TechCrunch, US News
Authored by Kimberly Woody
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