Comment by tristanj

Even assuming a post-IPO valuation drop by 50%, SpaceX would still be a top-25 US company by market cap.

Your "wait and see" argument doesn't apply, because (SpaceX, Anthropic, OpenAI) are excluded from the index for profitability reasons, not valuation reasons. These companies are deliberately reinvesting free-cash-flow into growth rather than booking GAAP profits. That's not going to change 6 months after IPO, and likely not for 3-5 years.

At the current pace, three of the ten largest US companies will not be included in the S&P 500, for probably 5 years after IPO.

The question still remains: should a benchmark that claims to represent large-cap US equities exclude companies that are demonstrably large-cap, just because they allocate their capital towards growing the company instead of generating profits?