For years, if you wanted to understand the private markets, you looked at a handful of names.
SpaceX. OpenAI. Anthropic.
These companies did not just dominate headlines. They dominated trading activity in the private secondary market. They became the benchmark names that investors, employees, funds, and platforms watched closely.
Now, with SpaceX reportedly entering the public markets at a valuation of around $1.75 trillion, a bigger question emerges:
What happens to the private market when one of its biggest stars leaves?
The answer matters far beyond SpaceX itself.
The Rise of the Secondary Market
The private secondary market has grown dramatically over the past few years.
According to PitchBook, U.S. venture secondaries reached approximately $106.3 billion in 2025, making it one of the largest sources of liquidity in venture capital.
For context:
- Venture acquisitions totaled roughly $140.7 billion
- Public listings generated around $119.6 billion
- Secondary transactions reached $106.3 billion
That means secondaries are no longer a niche corner of venture investing.
They have become a major pathway for investors and employees to access liquidity without waiting for an IPO or acquisition.
At first glance, this looks like a sign of a mature and healthy market.
But when you look beneath the surface, a different picture appears.
A Market That Is Bigger Than Ever, Yet Highly Concentrated
One of the most common narratives surrounding private markets today is that access is expanding.
More platforms exist.
More investors are participating.
More capital is flowing into private companies.
All of that is true.
What is less discussed is how much activity remains concentrated in a very small number of companies.
Some striking figures highlight this reality:
- The top 20 private companies accounted for approximately 86% of secondary trading value on Hiive during Q4 2025
- The top five names alone represented more than 55% of activity
- SpaceX was reportedly the single most traded company on several secondary platforms
- SpaceX, OpenAI, and Anthropic together are estimated to account for 30% to 40% of total secondary market volume
Think about that for a moment.
A market worth over $100 billion is still heavily dependent on just a few companies.
That is not broad diversification.
That is concentration.
The Surprising Statistic Nobody Is Talking About
The number that deserves more attention is not the size of the market.
It is the number of new companies entering it.
In 2025:
- Only 70 companies recorded their first-ever secondary trade
- Combined trading value across those new entrants was approximately $492 million
Compared with a $106 billion market, that is incredibly small.
In other words, most of the growth is happening within companies that are already actively traded.
The market is becoming larger.
It is not necessarily becoming broader.
That distinction is important.
What Changes When SpaceX Goes Public?
An IPO does not eliminate a company’s value.
It changes where that value is discovered.
Before listing, investors rely on occasional secondary transactions, tender offers, and private negotiations to estimate a company’s worth.
After listing, the market provides a public price every day.
That creates something private markets often struggle with:
Continuous price discovery.
For years, SpaceX has served as one of the strongest reference points in private investing.
Now investors will be able to watch a public market valuation update in real time.
That has implications not only for SpaceX shareholders but also for investors evaluating other late-stage private companies.
Questions that were previously answered with estimates may now be answered with market prices.
And that changes the conversation.
Two Very Different Futures
There are two competing views of what happens next.
Scenario 1: The Market Shrinks
This is the more cautious view.
If SpaceX, OpenAI, Anthropic, and other major private companies eventually list publicly, the secondary market loses a large portion of its most actively traded inventory.
Remember:
- The top three names may account for up to 40% of trading volume
- Only 70 new companies entered the secondary market last year
If replacements do not emerge quickly enough, trading activity could decline significantly.
The market becomes smaller simply because its biggest contributors have graduated.
Under this scenario, concentration does not disappear.
The market just loses some of its largest participants.
Scenario 2: The Market Expands
The more optimistic view argues the opposite.
Public listings create benchmarks.
Those benchmarks improve confidence.
Better price discovery can encourage more investors to participate in secondary markets.
As more capital enters the ecosystem, liquidity could gradually spread beyond the top handful of names.
Over time, investors may become more comfortable evaluating newer private companies because they have stronger public reference points.
This could eventually bring more companies into active trading and broaden the market.
The challenge is that this remains a forecast.
The data supporting it has not appeared yet.
Why Retail Investors Should Pay Attention
The conversation is especially relevant today because access to private markets is expanding.
Employees are selling shares.
Tender offers are becoming more common.
Funds are packaging exposure to private companies and offering it to a wider audience.
That sounds positive.
But investors should remember one important reality:
Not all private companies have the same level of liquidity or transparency.
The most popular names benefit from:
- Frequent transactions
- Greater media coverage
- More investor attention
- Better price discovery
Smaller private companies often have none of those advantages.
A valuation quoted for a thinly traded private company may not reflect what someone would actually pay in an open market.
That does not mean the opportunity is bad.
It simply means investors need to understand the difference between a well-established private market leader and a lesser-known company with limited trading activity.
The Bigger Lesson
The growth of secondary markets is real.
The demand is real.
The opportunity is real.
But the market remains more concentrated than many investors realize.
SpaceX’s IPO shines a spotlight on a question that private market participants will face repeatedly over the next few years:
Can the next generation of private companies replace the liquidity and attention generated by today’s giants?
For now, the evidence suggests that concentration remains the defining feature of the market.
The top names continue to dominate trading activity.
New entrants remain relatively scarce.
That may eventually change.
But today’s data tells a simple story:
The private secondary market is getting bigger. Whether it is getting broader remains an open question.
As SpaceX begins its life as a public company, investors will be watching closely to see who becomes the next major name on the private market tape.