SpaceX Is Quickly Entering Index Funds. Will OpenAI and Anthropic do the Same After Their IPOs?

SpaceX’s July 7 inclusion in the Nasdaq-100 could drive roughly $4.3B of passive buying via index-tracking funds, boosted by Nasdaq’s seventh-trading-day “fast-entry” rule. The article argues OpenAI and Anthropic could get similar early index exposure after IPOs, but S&P 500 inclusion is likely slower (still typically requires ~12 months of trading history and a profitability/GAAP net income screen). Despite potential index-demand support, both companies face significant valuation and profitability-timing risk, plus regulatory overhangs (e.g., potential 5% U.S. stake for OpenAI and model access constraints for Anthropic).

Analysis

The real winner is not the newly listed name; it is the exchange/index plumbing that monetizes the route from private hype to passive ownership. NDAQ has the cleaner leverage because faster entry rules increase listing relevance, trading volumes, and the value of being the preferred venue for a wave of mega-IPOs. SPGI is less exposed on the upside because its flagship benchmark still imposes seasoning/profitability gates, so the market may be overestimating how much of the AI IPO wave can flow straight into S&P-linked assets.

The immediate price effect of index buying is a flow event, not a durability event. Once the forced demand clears, the marginal buyer disappears while valuation scrutiny remains, which is especially important for companies with thin float and long-dated profitability. Over 1-3 months, the key catalyst is not inclusion itself but disclosure of float, lockup structure, and which benchmark each IPO actually qualifies for; that determines whether passive demand is a one-day pop or a sustained ownership base.

The contrarian miss is that investors are conflating benchmark eligibility with fundamental de-risking. For frontier AI names, a large headline valuation can still translate into a small float-adjusted index weight, so the passive bid may be far smaller than the narrative suggests. If the market starts pricing these listings as “new mega-caps,” any disappointment in float, profitability, or regulatory permissions should produce sharp multiple compression rather than a slow drift lower.

Key Decisions for Investors

• Long NDAQ / short SPGI for 1-3 months: asymmetric exposure to a more flexible IPO-index pipeline versus a benchmark provider whose flagship index remains structurally harder to enter. Use a relative-value frame; thesis fails if S&P rules are loosened or the IPO pipeline stalls.
• Fade post-inclusion flow in SPCX after the passive window closes: consider short-dated put spreads or reducing exposure into strength once forced buying is complete. Risk/reward is best if borrow is available and liquidity is deep enough; invalidated if the stock keeps rallying on additional benchmark demand.
• Do not preemptively bid AI IPOs before float terms are disclosed: wait for the prospectus and index eligibility details on OpenAI/Anthropic. If listed float is small, the index weight will be much lower than headline valuation implies; that is a watch item, not a chase.
• If OpenAI/Anthropic list on Nasdaq with meaningful float and index eligibility, buy the exchange/market-structure beneficiaries rather than the IPO itself: NDAQ call spreads or a cash equity long are cleaner expressions than paying peak valuation for the operating company.