Why SpaceX Broke One of Wall Street's Oldest IPO Traditions: Reinventing the IPO Lockup

Most Initial Public Offerings (IPOs) follow a familiar playbook.

A company sells shares to the public, the stock begins trading, and company insiders—including founders, executives, employees, and early investors—agree not to sell their shares for approximately six months. When that lockup period expires, a significant number of previously restricted shares become eligible for trading, often creating one of the first major events investors watch after an IPO.

SpaceX decided to take a different approach.

Rather than allowing a large number of shares to become eligible for trading on a single day, the company adopted a staged lockup schedule that gradually increases the number of shares available to the public over multiple milestones during its first year as a public company.

At first glance, that may seem like a minor technical detail hidden inside the IPO prospectus. It isn't. Understanding why SpaceX structured its lockup differently provides valuable insight into how newly public companies transition from private ownership to public ownership and how changes in the number of tradable shares can influence market behavior.

Although this article focuses on SpaceX, the concepts apply to many IPOs and will help you better understand how public markets work.

What You'll Learn

In this article, you'll learn:

• Why IPO lockups exist.
• The difference between shares outstanding and the public float.
• Why lockup expirations can influence stock prices.
• How SpaceX's staged lockup differs from the traditional 180-day approach.
• What investors should watch as SpaceX transitions through its first year as a public company.

Why IPO Lockups Exist

When a private company becomes publicly traded, it usually has far more shareholders than the investors who purchase shares in the IPO. Founders, executives, employees, venture capital firms, and other early investors often own billions of shares before the company ever reaches the public markets. If all of those shareholders were immediately free to sell after the IPO, the sudden increase in available shares could create significant uncertainty and unnecessary volatility.

IPO lockups were created to help prevent that situation. A lockup is a contractual agreement that temporarily prevents certain shareholders from selling their shares for a specified period after the IPO. During that time, the market has an opportunity to establish a trading price while investors begin evaluating the company as a public business.

The most common lockup period is approximately 180 days, although the exact terms can vary from one IPO to another. Once that lockup expires, the restrictions are removed and many previously restricted shares become eligible for trading. Notice the wording carefully. The shares are not created when the lockup expires. They already exist. They simply become available to trade in the public market. That distinction is one of the most important concepts investors should understand.

Shares Outstanding vs. Public Float

One of the easiest ways to understand a lockup expiration is to distinguish between shares outstanding and the public float. Shares outstanding represent every share that exists. The public float represents only the shares that investors can actually buy and sell on public stock exchanges. Those numbers are often very different.

Imagine a company has 10 billion shares outstanding, but only 500 million shares are available for public trading. Even though all 10 billion shares exist, investors can only trade the 500 million shares that make up the public float. If another 4 billion shares later become eligible for trading because lockup restrictions expire, the company hasn't created any new shares.

Ownership percentages remain exactly the same. What changed is the size of the public float. Instead of having 500 million shares available for trading, investors now have 4.5 billion shares available. The supply of tradable shares increased dramatically even though the total number of shares outstanding did not change.

Understanding that difference helps explain why lockup expirations receive so much attention from investors.

Why an Increase in Tradable Shares Can Affect Stock Prices

Stock prices are determined by supply and demand. When more investors want to buy a stock than sell it, prices generally move higher. When more investors want to sell than buy, prices often move lower until buyers and sellers reach an agreement on price.

A lockup expiration doesn't guarantee that a stock will decline. It simply increases the number of shares that can be sold. Whether those shares actually enter the market depends entirely on the decisions of the shareholders who own them.

A simple example illustrates the concept. Imagine there are 100 people interested in buying a collectible item, but only 20 are available for sale. Because supply is limited, buyers compete with one another and prices tend to rise. Now imagine another 200 identical collectibles suddenly become available. The number of buyers hasn't changed. The number of items available has. Instead of buyers competing for sellers, sellers begin competing for buyers. Some may lower their asking prices to complete a sale, placing downward pressure on prices until supply and demand reach a new balance.

Stocks behave in much the same way. When millions—or sometimes billions—of additional shares become eligible for trading, the potential supply available to the market increases. If a meaningful number of shareholders decide to sell around the same time, the additional supply can create downward pressure on the stock price. That doesn't necessarily mean anything has changed about the company's business. It simply reflects the economics of supply and demand.

Traditional IPO Lockups

Most IPOs follow a relatively simple pattern. After the company begins trading, insiders remain subject to lockup restrictions for approximately six months. When that period ends, the majority of restricted shares become eligible for trading at roughly the same time. Some shareholders choose to sell. Many continue holding their shares. The important point is that they now have the option to sell.

For investors, that single lockup expiration often becomes one of the first major milestones after an IPO because it can significantly increase the number of shares available in the public market. For decades, this has been the standard approach used by most companies going public.

SpaceX Took a Different Approach

Traditional IPO lockups are simple. Insiders wait approximately six months, and then a large number of previously restricted shares become eligible for trading at roughly the same time.

SpaceX chose not to follow that model. Instead, the company adopted a staged release schedule that gradually increases the number of shares eligible for trading throughout its first year as a public company. Rather than creating one significant increase in tradable shares, SpaceX spreads those releases across several milestones. The result is a gradual expansion of the public float instead of one large increase on a single day.

That difference may seem subtle, but it changes how investors think about the months following the IPO.

SpaceX's Public Float

One of the most interesting aspects of the SpaceX IPO is the difference between the total number of shares outstanding and the number of shares that were initially available for public trading.

Following the IPO:

• Approximately 12.8 billion shares were outstanding.
• 638.9 million shares were sold to public investors through the IPO.

Those 638.9 million shares became SpaceX's initial public float—the shares investors could actually buy and sell on public stock exchanges. The remaining approximately 12.2 billion shares continued to exist, but they remained largely in the hands of founders, employees, executives, and early investors whose shares were still subject to lockup restrictions. The numbers put that difference into perspective.

In other words, immediately following the IPO, investors could actively trade only about 5% of all SpaceX shares. The remaining 95% already existed, but they remained subject to lockup restrictions and therefore were not part of the public float.

As those restrictions are lifted over time, the public float gradually grows—not because SpaceX creates new shares, but because more of its existing shares become eligible for public trading.

The IPO didn't suddenly make all 12.8 billion shares available for public trading. Instead, it created a market where only about 5% of the company's shares were initially available for public trading. That relatively limited public float is one reason newly public companies can experience significant price movements during their first months of trading.

Traditional IPO vs. SpaceX

The difference between a traditional IPO and the SpaceX approach becomes much easier to understand when viewed side by side.

Traditional IPO

IPO
↓
638.9 Million Shares Become Publicly Tradable (Public Float)
↓
Approximately 180 Days
↓
Most Restricted Shares Become Eligible for Trading on the Same Day

For investors, there is typically one major milestone to watch. About six months after the IPO, a large number of previously restricted shares become eligible for trading all at once. If many insiders decide to sell, that sudden increase in tradable shares can place significant downward pressure on the stock price.

SpaceX

IPO
↓
638.9 Million Shares Become Publicly Tradable (Public Float)
↓
First Quarterly Earnings
↓
Up to 20% of eligible locked shares released + Additional 10% if the stock trades at least 30% above the $135 IPO price*
↓
70 Days
↓
Additional 7%
↓
90 Days
↓
Additional 7%
↓
105 Days
↓
Additional 7%
↓
120 Days
↓
Additional 7%
↓
135 Days
↓
Additional 7%
↓
Second Quarterly Earnings
↓
Additional 28%
↓
180 Days
↓
Remaining eligible shares released
↓
Founder restrictions continue for approximately one year

Rather than relying on one large lockup expiration, SpaceX gradually increases the number of shares eligible for trading over multiple events. Instead of asking the market to absorb one large increase in tradable shares, the company spreads those increases across its first year as a public company.

*The additional 10% performance-based release occurs only if the stock trades at least 30% above the IPO price for the required period specified in the S-1 filing.

Why the Difference Matters

At first glance, both approaches eventually lead to the same destination. Over time, more previously restricted shares become eligible for trading. The important difference is when those shares become available.

Imagine two highways carrying the same number of cars. On the first highway, every car arrives at the entrance ramp at exactly the same moment. Traffic quickly backs up as everyone tries to merge onto the road. On the second highway, the same number of cars arrive gradually over several hours. The total number of cars is identical, but traffic flows much more smoothly because the vehicles enter the highway over time rather than all at once.

The same principle applies to tradable shares. A traditional lockup allows a large number of shares to become eligible for trading at approximately the same time. SpaceX's approach gradually increases the number of tradable shares over several events, potentially reducing the likelihood of one significant supply shock affecting the market.

That doesn't mean the stock cannot decline after one of those milestones. It simply means investors may experience several smaller increases in tradable shares instead of one exceptionally large increase.

What SpaceX Investors Should Watch

The staged lockup means investors should pay attention to more than a single calendar date. Among the important milestones are:

• Quarterly earnings releases.
• Scheduled lockup release dates.
• Growth in the public float over time.
• Insider selling activity after shares become eligible for trading.

Each event provides additional information about both the business and the transition from private ownership to broader public ownership. Rather than focusing on one major lockup expiration six months after the IPO, investors should think of the first year as a gradual evolution in which more information becomes available and more shares become eligible for trading. That perspective is one of the unique aspects of the SpaceX IPO.

The Key Takeaway

Traditional IPOs typically have one major lockup event. SpaceX has several. Both approaches eventually allow previously restricted shares to become eligible for trading. The difference is that SpaceX spreads those releases across multiple milestones rather than concentrating them into one large event.

For investors, understanding that distinction provides important context for evaluating both the stock's behavior and the company's transition into the public markets.

What Investors Should Watch

SpaceX's staged lockup schedule changes how investors should think about the company's first year as a public company. Instead of watching for one large lockup expiration approximately six months after the IPO, investors should recognize that the public float will grow gradually over time. Each scheduled release represents another step in SpaceX's transition from a privately held company to one with broader public ownership.

That doesn't mean every milestone will have the same impact on the stock price. The market will continue to respond primarily to the company's financial performance, investor expectations, and overall market conditions. However, understanding when additional shares become eligible for trading provides important context for interpreting price movements that occur around those milestones.

Several factors deserve close attention.

Quarterly Financial Results

As with any public company, SpaceX's long-term value will ultimately be determined by its financial performance rather than its lockup schedule.Revenue growth, profitability, cash flow, margins, guidance, and management's execution of long-term business objectives will remain the primary drivers of shareholder value. Strong earnings may increase investor confidence and offset additional selling pressure. Weak earnings may have the opposite effect.

The lockup schedule simply determines when additional shares become eligible for trading—not how investors will react to the company's financial results.

Growth of the Public Float

The public float will gradually increase as additional shares become eligible for trading. That growth can improve market liquidity because more shares become available for buyers and sellers. Greater liquidity often benefits investors by making it easier to buy or sell shares without significantly affecting the stock price. Larger institutional investors also tend to prefer companies with deeper public floats because they can build or reduce positions more efficiently.

For newly public companies, expanding the public float is a natural part of the transition from private ownership to broader public ownership.

Insider Selling

One of the most closely watched events following any IPO is insider selling. It's important to remember that insiders sell shares for many different reasons. An employee may sell shares to purchase a home. A venture capital firm may distribute shares to its investors after holding the investment for years. Executives may diversify their personal finances rather than keeping the majority of their wealth tied to a single company.

None of those decisions necessarily indicate a lack of confidence in the business. Likewise, choosing not to sell doesn't automatically indicate optimism. Investors should avoid drawing conclusions from individual transactions and instead focus on broader trends over time.

What Makes SpaceX Different

Eventually, SpaceX's lockup restrictions may result in a public float similar to what investors would expect from a traditional IPO. The difference isn't the destination. It's the journey.

Traditional IPOs typically create one major lockup event approximately six months after the company goes public. SpaceX instead spreads those releases across multiple milestones, gradually increasing the number of shares available for public trading throughout its first year. Whether that approach ultimately reduces volatility remains to be seen. Markets are influenced by many factors beyond lockup schedules, including earnings results, investor sentiment, economic conditions, and overall market demand.

Nevertheless, SpaceX's approach represents one of the more innovative aspects of its IPO and demonstrates that even long-established Wall Street practices can evolve.

Key Takeaways

• Most IPOs use a lockup period of approximately 180 days before a large number of restricted shares become eligible for trading.
• A lockup expiration does not create new shares. It simply allows existing shares to be traded.
• Public float refers to the shares that investors can actually buy and sell on public stock exchanges.
• Following the IPO, only about 638.9 million of SpaceX's approximately 12.8 billion shares were initially available for public trading.
• That means roughly 95% of the company's shares remained restricted immediately following the IPO.
• SpaceX uses a staged lockup schedule that gradually increases the public float over multiple milestones rather than relying on one large release.
• A larger public float can improve liquidity, but stock performance will continue to depend primarily on the company's financial performance and investor confidence.

Final Thoughts

SpaceX's lockup structure offers an excellent example of why investors should look beyond the headlines when evaluating newly public companies. Understanding the difference between shares outstanding, public float, and lockup restrictions helps explain why changes in the number of tradable shares can influence market behavior—even when no new shares are created. More importantly, it illustrates that there is rarely only one way to bring a company to the public markets.

For decades, the traditional 180-day lockup has been one of the defining characteristics of an IPO. SpaceX challenged that convention by replacing one large release with a series of smaller milestones spread across its first year as a public company. Whether other companies eventually adopt a similar approach remains to be seen.

Ultimately, this story isn't just about SpaceX or lockup periods. It's about understanding how companies transition from private ownership to public ownership—and why that transition matters to investors. The better investors understand that process, the better equipped they are to evaluate newly public companies with confidence.

For investors, however, the lesson is already clear: understanding how shares enter the public market is just as important as understanding how many shares exist.