What Investors Should Know
SpaceX and the Index Effect
Author
Article Summary
SpaceX is one of the most high-profile IPOs in market history, but index inclusion isn't automatic, and it doesn't eliminate risk. Here's what investors and their advisors need to know about how major benchmarks handle newly public companies, and why staying focused on your financial plan matters more than the headlines.
SpaceX's public listing has quickly become one of the most closely watched market events of the year. The company and its founder (Elon Musk) are widely known, and the company is widely regarded as one of the most innovative private-to-public transitions in recent memory, large enough to potentially become an important part of the U.S. equity market.
For many investors, though, the most relevant question may not be whether to buy SpaceX directly. A better question may be:
When, and how, could SpaceX become part of the indexes and funds investors already own?
Which matters, because many investors gain exposure to public companies through index funds, ETFs, retirement plans, and other types of diversified portfolios. Whether SpaceX appears in those investments, how quickly it appears, and how large the position becomes will depend on the rules of each index.
Index Inclusion Is Not Automatic
Some people assume that a large company automatically joins major indexes. However, each index follows its own methodology.
Some indexes are broad and designed to capture much of the public equity market. Others are more selective. Some can add large newly public companies quickly, while others require a longer trading history, specific profitability measures, or committee approval.1,2,3
This means SpaceX could enter one index relatively quickly while taking longer to appear in another.
How Major Indexes May Treat SpaceX Differently
Below is a look at how some of the major index families think about the timing of inclusion to different indices.
|
Index or Index Family |
Nasdaq Composite |
Nasdaq-100 |
MSCI Indexes |
Russell / FTSE Indexes |
Total-Market Indexes |
S&P 500 |
Dow Jones Industrial Average |
|---|---|---|---|---|---|---|---|
|
Expected Timing |
Days to weeks after listing |
Within 15 trading days of IPO (if top 40 by market cap) |
10+ trading days (Fast Track Eligible) |
5+ trading days (Fast Entry eligible) |
Within first week of trading |
12+ months (profitability requirement not yet met) (A proposal to shorten its standard 12 month waiting after IPO was rejected by the index committee)9 |
Uncertain and unpredictable (inclusion is at committee discretion) |
|
Key Consideration |
Because SpaceX listed on Nasdaq, it may become relevant to broad Nasdaq-listed benchmarks relatively quickly, assuming it meets the applicable rules. |
The Nasdaq-100 methodology includes a process for certain very large newly listed companies to be considered before the normal annual reconstitution cycle. Timing and initial weight would still depend on eligibility, liquidity, and index methodology.5 |
MSCI has rules for adding large IPOs that meet size, liquidity, and free-float requirements, so some MSCI-linked portfolios may gain exposure before S&P 500-only portfolios.6 |
Russell and FTSE index families have their own IPO addition, free-float, voting rights, and reconstitution processes, which may result in a different timeline from Nasdaq or MSCI.7 |
Broad total-market indexes are generally designed to capture a broad investable market, but timing still depends on the specific index provider's rules.8 |
The S&P 500 is not simply the 500 largest companies. Inclusion depends on factors such as public float, liquidity, financial viability, trading history, and committee review.10 |
The Dow includes only 30 companies, is price-weighted, and is selected by committee, making inclusion less predictable and likely not the most immediate index question.11 |
What is Public Float and Why Does it Matter?
When a company goes public, not all shares are available for anyone to buy. Some shares are restricted:
- Founder and executive shares are often subject to lock-up agreements that prevent selling for months after an IPO
- Employee shares from stock compensation may have vesting periods or selling restrictions
- Early investor shares held by venture capital or private equity firms may be contractually locked up
- Government or strategic holdings may be considered long-term and non-tradable
The shares that are freely available for public trading are called the public float (or "free float").
What is "float-adjusted market cap"?
Most major indexes don't weight companies by their total market value. Instead, they use float-adjusted market capitalization, which only counts shares that are actually available for trading.
Here's a simplified example:
|
Measure |
Total Shares Outstanding |
Share Price |
Total Market Cap |
Shares in public float |
Float-adjusted Market Cap |
|---|---|---|---|---|---|
|
Calculation |
1 billion shares |
$200/share |
$200 billion |
50 million (5% of total shares) |
$10 billion (5% of total market cap) |
In this example, the company has a headline valuation of $200 billion, but its investable market cap for index purposes is only $10 billion.
Why This Matters for SpaceX
SpaceX is one of the largest private-to-public transitions in history, but estimates suggest only 4-7% of shares may be freely tradable at launch. That means:
- SpaceX's initial weight in indexes will be based on float-adjusted market cap, not headline valuation
- Index funds tracking those benchmarks will hold a smaller position than the "trillion-dollar company" headlines might suggest
- As lock-ups expire and more shares become tradable, SpaceX's index weight may increase over time
The valuation that SpaceX received at IPO was historically high, but its initial weight in certain indices may be smaller than its overall valuation suggests. 4
Index Inclusion Can Affect Demand, But Not Risk
When a company is added to a major index, funds that track that index may need to buy shares. That can create additional demand around the time of inclusion.
However, index inclusion does not guarantee positive returns. Markets often anticipate index changes before they happen, and the stock price may already reflect expected demand. A company's business risks, valuation, competition, execution challenges, and regulatory risks still matter.
Index inclusion may affect who owns a stock and how it’s owned. It does not eliminate the risks of owning it.
What This Means for Investors
Over time, investors may gain exposure to SpaceX depending on the funds they own. A Nasdaq-focused fund, a total-market fund, and an S&P 500 fund may each treat the company differently. It's important to be aware of the methodology, but even more important to not get caught up in the hype of a "hot IPO".
Some benchmarks may add the company relatively quickly. Others may wait for more trading history, greater public float, financial eligibility, or committee review. Even after inclusion, its weight in an index may depend on how many shares are actually available for public trading.
The main takeaway for advisors is to help clients stay focused on their overall financial plan. A company as prominent as SpaceX can attract significant attention, but portfolio decisions should still be guided by diversification, risk tolerance, time horizon, liquidity needs, and long-term goals.
For more insights on navigating today's markets, check out Markets In Focus: Navigating Complexity with a Measured Plan.
This material is for informational and educational purposes only and should not be construed as investment advice, a recommendation to buy or sell any security, or a forecast of future index inclusion. Index methodologies are subject to change. Investors should consult their financial professional regarding their own circumstances.
Investment Advice Offered through OneDigital Investment Advisors LLC. ID 00659791
Sources:
- MSCI, MSCI Global Investable Market Indexes Methodology"
- Nasdaq, "Nasdaq-100 Index Methodology"
- S&P Dow Jones Indices, "S&P U.S. Indices Methodology"
- See S&P Dow Jones Indices, MSCI, FTSE Russell, and CRSP methodology documents for the use of float or free float adjustments in index construction and weighting.
- Nasdaq, "Nasdaq-100 Index Methodology"
- MSCI, "MSCI Global Investable Market Indexes Methodology"
- FTSE Russell, "Russell U.S. Indexes Construction and Methodology"
- CRSP, "CRSP Market Indexes Methodology Guide"
- CNBC, "The S&P 500 already made a big call on SpaceX stock and index fund investors need to know it"
- S&P Dow Jones Indices, "Dow Jones Averages Methodology"
- S&P Dow Jones Indices, "Dow Jones Averages Methodology"