SpaceX’s explosive stock market debut has delivered windfall gains for early investors, but its impending inclusion in some of the world’s largest stock indexes is opening a new debate across Wall Street: whether passive investors are being forced to take on exposure to one of the market’s most volatile and controversial companies.
The Elon Musk-led company, which began trading last week in the largest initial public offering in history, has quickly become one of the world’s most valuable corporations. Following another strong session on Tuesday, SpaceX’s market capitalization climbed to roughly $2.7 trillion, making it the fifth-largest company globally and placing it ahead of many long-established corporate giants.
Its rapid ascent is now forcing major index providers and fund managers to determine how the stock will be integrated into benchmark portfolios that millions of investors own through retirement accounts, mutual funds, and exchange-traded funds.
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For some market participants, that prospect is generating unease.
“In many ways, SpaceX is a lot like bitcoin: it has no earnings, no yield, is so far extremely volatile, and has about as many haters as it does hardcore believers,” observers have noted. The key distinction, they argue, is that investors can choose whether to own bitcoin, whereas many may soon gain exposure to SpaceX through index funds, whether they want it or not.
Passive Investors Face Unavoidable Exposure
Major index providers, including Nasdaq, CRSP, FTSE Russell, and MSCI, have already taken steps to accommodate SpaceX within their large-cap benchmarks. Because of the company’s enormous market value, its inclusion is expected to affect a wide range of passive investment products, including popular growth-focused exchange-traded funds.
Among the concerns is the potential impact on portfolio volatility. According to market data, SpaceX’s implied volatility stood near 120 on Tuesday, roughly three times higher than that of the iShares Bitcoin ETF. If it were already part of major benchmarks, it would rank among the most volatile stocks in both the Nasdaq 100 and the S&P 500. The company also stands out because it remains unprofitable despite its trillion-dollar valuation, an unusual characteristic among the largest publicly traded corporations.
For critics, this raises questions about whether index investors are being exposed to risks they never actively chose.
Ayman Saidi, partner at Strategic Investment Solutions, said Vanguard and other large money managers who are going along with Nasdaq’s mandate and rule change are betraying U.S. savers. VUG in my portfolio will likely own SpaceX soon.
“This is why I like Dimensional Funds: they do not simply copy an index. It will be a major market distortion.’”
Index funds have become the dominant force in global markets because they offer low costs and broad diversification. Yet many believe that when an index automatically absorbs a company of SpaceX’s size and volatility, investors lose the ability to make active judgments about valuation and risk.
Comparisons With Bitcoin And AI Speculation
SpaceX’s valuation and trading behavior have drawn comparisons not only with technology stocks but also with cryptocurrencies. Like bitcoin, supporters see the company as a transformative platform tied to powerful long-term trends including artificial intelligence, space infrastructure, satellite communications, and autonomous systems.
Skeptics, however, question whether the company’s valuation has run too far ahead of its underlying financial performance. The debate has intensified because SpaceX is no longer solely a rocket company.
Earlier this year, Musk combined SpaceX with artificial intelligence startup xAI, further increasing investor enthusiasm around AI-linked growth opportunities. That combination of space technology and AI has turned the company into one of the market’s most speculative and polarizing investments.
Kevin Kelly, co-founder of research firm Delphi Digital, argued that investor appetite for risk remains strong.
“At this point, if you’re allergic to volatility, you might just want to be in bonds,” Kelly said.
“AI has captivated a lot of the speculative audience and some of these AI stocks look like early token charts. Plus, SpaceX is so polarizing, there are people in the more traditional sell-side camp that couldn’t even get past this if it IPO’d at $600-or-700 billion.”
Following its IPO, SpaceX has become a symbol of the broader speculative enthusiasm surrounding artificial intelligence and next-generation technologies.
Why Index Inclusion May Eventually Reduce Volatility
Not everyone believes SpaceX’s extreme price swings will persist. Some investors argue that becoming part of major indexes could actually help stabilize the stock over time.
Index inclusion typically increases liquidity because large institutional investors, passive funds, and high-frequency trading firms continuously buy and sell shares as they rebalance portfolios. The result is often a deeper and more efficient market with less dramatic price movements.
Noel Smith, founder and chief investment officer of Convex Asset Management, believes that dynamic will eventually work in SpaceX’s favor.
“Going in the index will reduce SpaceX vol – no way it stays at 120,” Smith said.
“HFTs constantly rebalancing, passive flows that don’t sell, there’s way more liquidity.”
That view reflects a common pattern seen with other heavily traded securities. While initial excitement can generate extreme volatility, broader ownership and deeper trading activity often dampen fluctuations over time.
A New Test For Passive Investing
SpaceX’s inclusion in major indexes represents more than just another stock addition. It is emerging as a test of how modern passive investing handles companies whose market values soar despite limited earnings visibility and exceptionally high volatility.
The stock’s arrival also comes at a time when passive investment vehicles control a larger share of global assets than ever before. As a result, decisions made by index providers increasingly influence capital allocation across financial markets.
Supporters argue that index funds are simply reflecting market realities. If investors collectively assign SpaceX a multi-trillion-dollar valuation, then benchmarks should incorporate that judgment. Critics counter that such an approach can amplify speculative excesses by funneling even more capital into already richly valued companies.
For now, investor enthusiasm remains firmly in control. SpaceX has gained roughly 50% since its IPO pricing, and the company continues to benefit from optimism surrounding AI, satellite communications, defense technology, and commercial space exploration.
Whether that enthusiasm proves justified over the long run remains one of the most consequential questions facing markets in 2026. As index providers prepare to add SpaceX to benchmark portfolios, millions of investors may soon find themselves participating in that debate, whether they intended to or not.