Going public used to be the defining moment for an American company. The IPO was the finish line — proof that a business had made it, the mechanism through which founders and early investors converted years of risk into liquid wealth, and the entry point for ordinary investors who wanted a piece of the growth story.
That model is losing its hold. Quietly, and without much fanfare, a structural shift has taken place in how successful companies think about when to go public (or whether to go public at all).
The numbers tell a clear story: IPO companies are arriving older and much bigger
The median age of companies going public has nearly doubled over the past decade, rising from 6.9 years to 10.7 years as of 2025, according to Morningstar data. But age alone understates the change. Research by Jay Ritter at the University of Florida found that median revenue at IPO has climbed from $16 million in 1980 to $218 million in 2024, adjusted for inflation. Companies are arriving at public markets larger, more mature, and less dependent on public capital than their predecessors were.
The pool of public companies reflects this. U.S. SEC data shows total reporting issuers fell from 8,351 in 2023 to 7,902 in 2024. More companies are reaching scale without ever touching a public exchange.
Private markets built the infrastructure the IPO once monopolized
The reasons are structural rather than cyclical. Public markets impose a set of demands that many founders and executives find increasingly unappealing: quarterly earnings scrutiny, regulatory compliance costs, activist investor pressure, and a market that can reprice a decade of growth in an afternoon based on a single guidance revision.
Private markets have responded by developing the infrastructure to support companies at sizes that once would have required public capital. Sovereign wealth funds, pension systems, and large institutional investors have steadily increased their allocations to private assets, giving companies access to billions in capital without disclosing their financials to the public or answering to retail shareholders.
The other structural shift is liquidity. Historically, staying private meant illiquidity — employees sitting on paper wealth they couldn’t access, early investors unable to exit. That constraint has weakened considerably. Private secondary markets have matured significantly, giving investors and employees a way to monetize equity without waiting for a public offering. What was once a niche corner of the financial system has become a mainstream mechanism for managing liquidity in private portfolios, reducing one of the central pressures that pushed companies toward public markets in the first place.
The shift is real, even if it’s uneven
It is worth noting that the trend is not uniform. Vanguard published research arguing that average IPO age has not shifted materially in aggregate over the past two decades — a useful counterpoint that suggests the “staying private” story is concentrated in specific segments rather than a universal pattern.
The clearest manifestation is in well-capitalized, late-stage technology companies that have access to large private funding rounds and little need for public market validation. But the PE-backed middle market tells a parallel story: hundreds of thousands of private companies that were never likely IPO candidates, now supported by a private capital ecosystem that has grown sophisticated enough to fund them across every stage of the capital structure.
What it means for investors
The practical consequence of this shift is that an increasing share of company growth is happening before public markets ever see it. The businesses generating the most interesting returns — scaling revenues, expanding margins, building durable competitive positions — are doing much of that work in private hands.
For investors accustomed to accessing growth through public equities, this creates a real problem. The publicly traded universe is increasingly a lagging indicator of where value is being created, populated by companies that have already done much of their growing. Gaining earlier access requires engaging with private markets in a more deliberate way — something that was once reserved for large institutional allocators and is now within reach of a much broader set of investors.
The IPO is not disappearing. But its role as the primary gateway to growth is diminishing, and the companies choosing to stay private longer are making a rational calculation that the infrastructure now exists to support them without it.
