2026-06-14

S&P 500 Keeps SpaceX, OpenAI, and Anthropic Out of Fast-Track Index Inclusion

For anyone building with Claude or watching the broader AI company financing boom, this is a useful reality check. The story isn’t really about one index rule; it’s about how far public-market plumbing will go to accommodate “mega-cap” AI-era companies before it decides enough is enough.

Key Points

S&P Dow Jones Indices rejected a proposal that would have sped up S&P 500 eligibility for SpaceX and, by extension, potentially helped future IPOs from OpenAI and Anthropic.
The proposed changes would have loosened several requirements for “MegaCap” companies, including:
- shortening the IPO seasoning period from 12 months to 6 months,
- waiving the minimum public float requirement,
- and waiving profitability requirements.
SpaceX wanted to float only about 3% of shares publicly, and it is currently unprofitable with a reported $29 billion debt load tied to AI infrastructure spending.
S&P said it would make no changes to eligibility criteria, including financial viability screens, seasoning period, or minimum investable weight factor.
If SpaceX had been fast-tracked into the S&P 500, passive funds could have bought roughly $14 billion of its stock, according to Bloomberg Intelligence.
Bloomberg Intelligence estimated similar passive buying could have brought OpenAI more than $8 billion and Anthropic $4.6 billion if they had entered under the same kind of rule relaxation.
The S&P 500 matters because trillions of dollars in passive funds track it automatically, so index inclusion can become a massive demand signal for a stock.
S&P did make a narrower concession for some lower-profile indexes, but not for the S&P 500.
Nasdaq and FTSE Russell, by contrast, have already changed some rules to allow faster inclusion for SpaceX in other indexes.
Morningstar recently described SpaceX as “significantly overvalued” ahead of its IPO, valuing it far below its reported IPO target.

My Take

What strikes me is how much this story is really about market structure, not just SpaceX. The S&P 500 is one of the few gatekeepers that still has the power to say: no, hype alone doesn’t get you automatic access to the biggest passive capital pool on earth.

From a Claude / Claude Code perspective, I think the most interesting part is the implied precedent. If the S&P had bent the rules for SpaceX, it might have quietly normalized a new category of AI-first, not-yet-profitable companies getting index oxygen before they’ve proved durable economics. That would have been great for founders and bankers, but I’m not convinced it would have been good for ordinary investors.

I’d be curious whether people in AI circles are overestimating how much prestige-index inclusion matters versus the more practical question of whether these companies can survive the cost structure they’ve chosen. OpenAI and Anthropic are already in a world where model training, inference, and infrastructure are brutally expensive. If they go public, the market may care far more about margins, cash burn, and customer concentration than about any symbolic “MegaCap” label.

What I also like here is the reminder that passive money is not neutral in the way people sometimes pretend. Index rules shape capital flows, which shape behavior. If those rules got loosened for speculative AI-adjacent companies, that might have increased the incentive to chase scale and narrative before profitability.

The takeaway: S&P refused to turn its flagship index into an early-stage funding mechanism for SpaceX-style moonshots. For AI companies eyeing public markets, that’s a sign they’ll likely have to earn inclusion the old-fashioned way.