SpaceX, Other Mega IPOs Denied Fast Index Entry by S&P

Original Article ↗ Hacker News Discussion ↗

S&P’s decision and overall sentiment

  • Most commenters welcome S&P’s choice not to fast‑track mega‑IPOs (e.g., SpaceX) into the S&P 500.
  • Seen as preserving trust, stability, and avoiding the appearance of providing “exit liquidity” to insiders.
  • Some think this may cost index investors a bit (buying later at higher prices), but consider the trade‑off for credibility worth it.

Fast‑track rules at other index providers

  • Nasdaq 100, FTSE Russell, MSCI, and CRSP have introduced or adjusted fast‑entry rules for very large IPOs with low float.
  • For Nasdaq 100, new rules use float‑adjusted hybrids (e.g., 3× float up to a threshold), so initial weights are still small.
  • S&P did tweak rules for its total‑market indices to allow faster inclusion of megacaps there, but not for the S&P 500.

What an index is “for”

  • One camp: S&P 500 is the de facto benchmark for U.S. large‑caps and should include major companies (SpaceX, OpenAI, Anthropic) quickly, or it ceases to be an accurate “gauge.”
  • Other camp: S&P 500 is a curated, committee‑run large‑cap index with explicit filters (profitability, float, trading history) and is not meant to mirror the entire market or speculative IPOs.
  • Debate over rule changes: are they legitimate adaptation to a market where firms IPO later, or “active management” and rule‑bending for specific companies?

Impact on investors and retirement assets

  • Many note that most retirement money is in target‑date or multi‑index products, not a single S&P 500 fund.
  • Concern about forced buying by index funds at inflated IPO prices, front‑running, and additional drag on returns.
  • Others argue the actual index weights at IPO (given low float) are tiny, so portfolio impact is small; the drama is exaggerated.

Megacap IPOs, valuation, and bubble fears

  • Strong skepticism that SpaceX, OpenAI, Anthropic are worth current trillion‑level valuations, especially with low float and heavy AI‑driven narratives.
  • Fears of a “grift” or AI bubble, with rules engineered to socialize downside via passive funds.
  • Counter‑view: if these firms genuinely become huge, excluding them for years undermines benchmarks; if they’re overvalued, the market will correct and they’ll naturally shrink in index weight.