SpaceX Index Inclusion Forces Passive Investors Into Most Volatile Trillion-Dollar Stock

SpaceX's integration into major index funds this summer is drawing sharp criticism from financial advisors, who argue that passive investors — many of whom avoided volatile assets like bitcoin — are now being compelled to hold a stock with implied volatility nearly three times higher than the iShares bitcoin ETF.

SpaceX's implied volatility stood at approximately 120 as of Tuesday's session, compared to the iShares bitcoin ETF's (IBIT) reading at roughly one-third of that level. As of Tuesday's trading, SpaceX would be the most volatile constituent in both the S&P 500 and the Nasdaq 100 — and the only company with a market cap exceeding $1 trillion that does not generate a profit.

The company's market capitalization reached $2.7 trillion following a 4.5% rally on Tuesday, making it the fifth-largest company in the world by that measure.

CRSP market indexes, Nasdaq, FTSE Russell, and MSCI have all adjusted their large-cap trackers to accommodate SpaceX, following the company's IPO on June 12. The moves will push the stock into widely held exchange-traded funds, including those from Vanguard, that form the core of many American retirement and investment portfolios.

"Vanguard and other large money managers who are going along with Nasdaq's mandate and rule change are betraying U.S. savers," said Ayman Saidi, partner at Strategic Investment Solutions, an Orland Park, Illinois-based registered investment adviser. "VUG in my portfolios 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."

VUG refers to the Vanguard Growth Index Fund ETF.

The scale of SpaceX's market cap means its impact on index-level volatility will be substantially larger than past high-profile additions. When Strategy was added to the Nasdaq 100 in December 2024, it was trading below a $100 billion market cap — a fraction of SpaceX's current size.

"At this point, if you're allergic to volatility, you might just want to be in bonds," said Kevin Kelly, co-founder of Delphi Digital, a research firm founded by former Bloomberg analysts in 2018. "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."

Some market participants see the volatility as temporary. Noel Smith, CIO and founder of Convex Asset Management, said index inclusion itself should act as a stabilizing force over time.

"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 is reinforced by SpaceX's own options market, where implied volatility in later-dated contracts — those extending beyond the insider lockup period — does begin to decline more sharply than for comparably volatile names like Micron.

For now, the broader debate centers less on SpaceX's long-term trajectory and more on what obligations index providers and fund managers bear to investors who chose passive vehicles precisely to limit exposure to speculative, high-volatility assets. With the summer integration window approaching, that question is unlikely to resolve quietly.

Disclaimer