SpaceX investors have spent weeks bracing for what looks like the company's biggest post-IPO test yet. Following Tuesday's earnings report, roughly 911 million shares are scheduled to become eligible for sale under the company's staggered lock-up schedule.

At first glance, the numbers sound alarming. A billion new shares in Elon Musk's rocket company becoming eligible for sale would seem like the perfect recipe for renewed selling pressure.

But investors may be asking the wrong question.

The real issue isn't how many shares become eligible for sale. It's how many are actually likely to hit the market.

Eligible Doesn't Mean For Sale

The upcoming unlock represents only about 7% of SpaceX's roughly 13.09 billion shares outstanding. More importantly, most of those shares are held by executives, employees and early investors rather than short-term traders.

A lock-up expiration simply gives shareholders the ability to sell. It doesn't require them to.

History shows that lock-up expirations don't always lead to heavy selling. While some investors use the opportunity to diversify or realize gains, others continue holding their positions—particularly when shares are trading well below recent highs.

SpaceX's staggered release schedule also spreads potential supply over multiple earnings periods rather than releasing it all at once.

A 50% Decline Changes The Equation

Timing may also reduce the likelihood of widespread selling.

Since reaching an intraday high of around $225 shortly after its June IPO, SpaceX shares have fallen roughly 50%, recently trading near $110 ahead of earnings.

That doesn't necessarily mean insiders won't sell. Some early investors may still choose to rebalance portfolios or monetize part of their holdings. But for executives and employees whose wealth remains closely tied to the company's long-term performance, selling after such a sharp decline may be less attractive than waiting for a higher valuation.

The Overhang May Matter More Than the Selling

That doesn't mean the unlock is irrelevant.

Since its IPO, SpaceX has had a relatively small public float, or the shares available for public trading. A limited float can amplify price swings in either direction, making changes in available supply an important factor for investors.

Even if only a fraction of the newly eligible shares is ultimately sold, the market knows the tradable float will continue expanding over time. That alone could reduce some of the scarcity premium investors have assigned to the stock since its debut.

Ultimately, SpaceX's earnings will remain the primary catalyst. Strong results and upbeat commentary on Starlink, artificial intelligence initiatives and long-term growth could attract fresh buying interest.

For investors, the real post-earnings question isn't whether 911 million shares become eligible for sale. It's whether enough of them actually come to market to overwhelm demand—or whether Wall Street has been overestimating the risk all along.