Will SpaceX be added to index funds? For most major indices, the answer is yes — and faster than you might expect. Funds tracking the NASDAQ 100, the Crisp Total Market Index (behind Vanguard's VTI), MSCI, and FTSE Russell US indices are all expected to include SpaceX within days of its IPO, thanks to rule changes many of these index providers adopted specifically ahead of this listing. The one major holdout is the S&P 500, which is sticking to its existing 12-month seasoning requirement. If you hold a broad US equity index fund, there's a good chance you'll own a slice of SpaceX whether you chose to or not — here's exactly what that means for your portfolio.

Which Index Funds Will Buy SpaceX After the IPO?

The short answer: most of them, and quickly. Here's a breakdown of the major indices and their expected approach to SpaceX inclusion.

Ben Felix breaks down exactly which indices changed their IPO inclusion rules and what each change means 03:45 Ben Felix breaks down exactly which indices changed their IPO inclusion rules and what each change means Watch at 03:45 →

NASDAQ 100

NASDAQ adopted new rules that allow inclusion after just the 15th trading day for stocks ranking in the top 40 by total market cap. SpaceX easily clears that bar. NASDAQ also removed its 10% free float requirement — which is notable since that requirement was only added in June 2024. Because the NASDAQ 100 normally weights stocks by total market cap rather than free float, SpaceX's roughly $1.88 trillion total valuation would have made it a massive position. To address this, NASDAQ introduced a cap of three times the free float for low-float stocks. So SpaceX gets in quickly, but at a more modest weight than its full market cap would imply.

Crisp Total Market Index (Vanguard VTI)

Crisp — which runs the index behind Vanguard's VTI ETF and was recently acquired by Morningstar — has actually had fast-track IPO inclusion for years, allowing entry after just five trading days. They did quietly update their free float requirement, lowering the threshold so that large companies like SpaceX with a low float percentage but a high dollar float value can qualify. Crisp estimates SpaceX will make up approximately 0.12% of the US Total Market Index at its initial low float. If you hold VEQT, the Vanguard All Equity ETF, 45% of it is in VUN which tracks this index — meaning SpaceX would represent about 0.05% of VEQT right after the IPO. Small, but it's there.

MSCI

MSCI didn't need to change its rules because it already had fast-track inclusion for large IPOs — after 10 trading days, provided the company meets size thresholds. SpaceX comfortably passes those tests. MSCI seems to be quietly pointing out that other providers scrambled to catch up to what they were already doing.

Side-by-side comparison of how each major index weights SpaceX based on free float vs. total market cap 09:20 Side-by-side comparison of how each major index weights SpaceX based on free float vs. total market cap Watch at 09:20 →

FTSE Russell

FTSE Russell made changes in February, introducing a fast-entry rule for top-500-sized companies. Eligible IPOs get added after the close of the fifth trading day following listing. SpaceX qualifies based on its S-1 filing, even accounting for the low initial free float, because its staged lockup releases are expected to bring the float above minimums within 12 months of inclusion.

Why Won't the S&P 500 Include SpaceX Right Away?

This is where it gets interesting. While every other major index provider either changed their rules or already had fast-track inclusion, S&P went in the opposite direction. They were proposed three significant changes: reducing the IPO seasoning period from one year to six months, waiving their investable weight factor for mega-cap companies, and allowing financially unviable companies (those without net positive income) to be included. S&P rejected all three. That means SpaceX cannot enter the S&P 500 until mid-2027 at the absolute earliest — and only if it's profitable by then. The S&P Total Market Index is a different story; it already had fast-track rules and S&P did update it to remove the 10% free float requirement for companies ranked in the top 100 by total market cap. ETFs like ITOT and IUSG track that index and should include SpaceX quickly. But the flagship S&P 500? Not for a while. This matters because the S&P 500 has more assets tracking it than any other index in the world. The divergence between S&P 500 performance and other US indices could be notable depending on how SpaceX's stock performs in its first year.

How Do Stock Indices Decide When to Add IPOs?

Every index has rules — and those rules determine when a newly public company becomes part of the fund you're holding. Common factors include a seasoning or waiting period (how long the stock has been trading), a free float requirement (what percentage of shares are available for public trading), and size thresholds (the company needs to be big enough to matter to the index). For most of financial history, these rules meant IPOs had to wait months, sometimes a year or more, before landing in your index fund. The logic was sound: let the market settle, verify liquidity, confirm the company meets the criteria. But SpaceX's impending IPO — expected to be the largest in history by capital raised — exposed a tension in those rules. If an index is supposed to represent the investable stock market, and the biggest company to ever go public is excluded for a year, is it really doing its job? That's the philosophical debate playing out behind all these rule changes.

The staged lockup release schedule for SpaceX insiders — and how it affects float-weighted index positions over time 17:10 The staged lockup release schedule for SpaceX insiders — and how it affects float-weighted index positions over time Watch at 17:10 →

Are Index Funds Actually Passive? The SpaceX Case

The SpaceX IPO is a useful reminder that index funds are not as passive as the name implies. Index funds mechanically follow rules — but someone writes those rules, and those rules change. When Crisp quietly updates its free float threshold without a public consultation, or when NASDAQ drops a requirement it added less than a year earlier, those are active decisions with real consequences for investors. Stocks that qualify for fast-track index inclusion tend to see a price jump leading up to that inclusion date, as traders anticipate the mandatory buying from index funds. That front-running effectively imposes a small but real cost on index fund investors. None of this makes index funds bad — they remain the best option for most investors. But it does mean that truly rules-based, low-cost investing isn't perfectly passive. Some fund managers, like Dimensional Fund Advisors and Avantis, run low-cost, broadly diversified funds with the discretion to decide whether to participate in IPOs — a structure that captures the benefits of passive investing while avoiding some of its mechanical inefficiencies.

What Is SpaceX's Free Float and Lockup Structure?

SpaceX is expected to have an initial free float of around 4% — meaning only 4% of the company's total shares will be freely tradable at launch. That's why free float rules matter so much in this conversation. Most of the company is still held by insiders under lockup restrictions. But SpaceX's lockup structure is unusually staged compared to a typical 180-day cliff. Here's how it works:

Chart showing 60% average decline in retail IPO stocks one year after offer price, from the 2025 research paper 22:35 Chart showing 60% average decline in retail IPO stocks one year after offer price, from the 2025 research paper Watch at 22:35 →
  • After the second trading day following the first earnings release: 20% of restricted shares can be sold.
  • If the stock trades 30%+ above offering price for 5 of 10 trading days ending on the first earnings release date: an additional 10% is released.
  • 70, 90, 120, and 135 days after listing: additional blocks of 7% each become available.
  • After Q3 earnings: another 28% is released.
  • After 180 days: any remaining lockup shares are released.

This staged release matters for index weighting. A company that starts at a 4% float but grows to 50% float will see its weight in float-weighted indices climb substantially over time. At 50% float, Crisp estimates SpaceX would represent 1.33% of the US Total Market Index — more than ten times its initial weight.

What Does the Data Say About Retail IPO Access?

SpaceX is targeting an unusually large retail allocation — around 30% of the IPO, versus the typical 5–10%. They've set their IPO price ahead of time rather than using traditional book-building, and retail brokers like Fidelity (lowering its minimum to $2,000), Robinhood, SoFi, and Wealthsimple in Canada are all offering access. This all sounds compelling, especially given the well-documented IPO pop — where shares jump from offer price to first-day trading price. But a 2025 paper titled Retail IPO Access: High Hopes, Low Returns found that 24 IPOs with retail allocations via Robinhood and SoFi declined by over 60% from their offer price after one year, underperforming comparable non-retail IPOs by 20 percentage points. Two mechanisms explain this. First, adverse selection: underwriters tend to push retail allocations on more aggressively priced deals, meaning retail investors are more likely to end up with the deals institutions passed on. Second, attention-driven trading: push notifications sent to millions of brokerage users spike search interest and first-day buying pressure, temporarily inflating prices — before that attention fades and prices fall. When researchers controlled for first-day retail trading volume, the underperformance gap disappeared, suggesting the attention effect accounts for much of the damage. As one institutional investor quoted in the paper put it: if a retail investor can get an IPO allocation, they probably don't want it.

None of this means SpaceX's stock will drop. Elon Musk has a uniquely loyal retail investor base with a demonstrated willingness to buy at premium valuations. But the historical pattern for retail IPO access is worth understanding before you request an allocation. Caution is warranted — not panic, just eyes-open awareness of what the data shows.

What This All Means for Your Portfolio

If you hold a broad US or global equity index fund, you will likely own SpaceX shares within days of its IPO — automatically, and at whatever price the market sets in those first few trading sessions. The weights will be small initially, typically well under 0.2% in most float-weighted indices, but they'll grow as lockup shares are released. The S&P 500 remains the notable exception, creating a real performance divergence between it and other US equity benchmarks depending on how SpaceX trades. For retail investors considering a direct IPO allocation: the historical evidence on retail IPO programs is not encouraging, the lockup structure and attention dynamics are worth studying closely, and the usual advice applies — don't invest money you can't afford to lose in something this speculative. The SpaceX IPO is historic. That doesn't automatically make it a good trade.