Key Points

Elon Musk's SpaceX achieved a historic milestone by securing $75 billion through its initial public offering and outpacing firms such as Amazon, Broadcom, and Tesla in overall market value.
Modifications to index eligibility standards along with the firm's unusually small tradable share base are providing a short-term lift to its valuation.
Yet the company's phased lockup timeline stands to create significant difficulties for individual shareholders.

Just over a week ago, Space Exploration Technologies (SpaceX) (NASDAQ: SPCX) marked a notable achievement on Wall Street by raising $75 billion in its IPO and emerging as one of the largest publicly traded entities.

Following three trading days through June 16, the AI and space-focused enterprise reached a $2.66 trillion market capitalization, moving ahead of established leaders including Amazon, Broadcom, and Tesla.

Several elements have supported early momentum for SpaceX shares. However, these initial advances risk turning problematic for retail participants once the distinctive lockup timeline begins.

Image source: Getty Images.

Index rule adjustments and limited float are supporting the share price

While enthusiasm around the SpaceX IPO has been strong, changes to major index criteria and the historically limited float are the main drivers behind the rapid early gains since June 12.

Prior to the public debut, oversight bodies updated inclusion guidelines. Nasdaq Global Indexes eased float thresholds for the Nasdaq-100, allowing top-ranked companies fast-track entry after 15 sessions instead of roughly three months. Shortly afterward, Russell Equity Indexes permitted large new listings to join relevant benchmarks after five trading days rather than quarterly reviews.

These updates enable quick addition to the Nasdaq-100, Russell 1000, and Russell 3000. As a result, passive vehicles tracking those benchmarks must acquire shares soon after listing, generating substantial forced demand.

SpaceX offered about 555.6 million shares in the IPO, equating to roughly 4 percent of outstanding stock, well below the typical 10 to 25 percent range. Combined with index-driven purchases, this limited supply is expected to create a temporary upward effect on pricing.

Image source: Getty Images.

Staggered lockup timeline may harm retail investors

Given Musk's track record with Tesla and SpaceX's focus on high-growth areas like AI and space, shareholders might feel confident. Still, relying on continued artificial support is likely unwise.

Once index-related buying fades and the small initial float is absorbed, the setup could facilitate a notable shift of value from retail holders to company insiders.

Standard lockups last 180 days from the IPO date to curb early selling by executives and early backers. SpaceX instead uses a graduated schedule. Certain insiders, excluding Musk who faces a 366-day restriction, may begin selling after the first quarterly report in August. Additional portions become available on days 70, 90, 105, 120, 135, and 180, or if the stock rises more than 30 percent above the IPO price.

This structure allows insiders to sell gradually while index inflows remain active, potentially pressuring shares over an extended period. The prospectus also notes plans for debt and dilution to finance data-center growth and acquisitions, adding further considerations for shareholders.

Additional factors such as profitability challenges, slower growth compared with peers in AI, and an elevated price-to-sales multiple also warrant attention. The lockup arrangement represents only the initial catalyst that could affect retail positions.

Should investors purchase Space Exploration Technologies shares at present?

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Sean Williams holds shares in Amazon. The Motley Fool holds positions in and recommends Amazon, Broadcom, and Tesla. The Motley Fool recommends Nasdaq. The Motley Fool maintains a disclosure policy.

The opinions expressed are those of the author and do not necessarily represent the views of Nasdaq, Inc.