The 14-Year IPO: How Public Markets Stopped Working for Retail

The 14-Year IPO: How Public Markets Stopped Working for Retail

The IPO used to be where ordinary investors got a seat at the table. That stopped being true some time around the turn of the millennium. The numbers tell the story plainly. In 1999, the median US technology company went public about five years after founding. By 2024, that median had stretched to roughly fourteen years. The same vehicle that once delivered companies to retail in their compounding years now delivers them after the compounding has already happened.

This piece is the data behind that shift. The figures pull from SEC filings, S-1 prospectuses, public statements from the SEC's Office of the Advocate for Small Business Capital Formation, and Pitchbook and CB Insights aggregate reports. We have linked the underlying sources where they exist on the public record so you can verify the math.

The old IPO: small enough to compound

For most of the second half of the twentieth century, the best-known American consumer and technology companies arrived on the public market while the bulk of their growth still lay ahead of them. A retail investor opening a brokerage account in the 1980s or 1990s could, in principle, hold the same shares as the institutions buying alongside them.

A short table makes the point.

Sources: each company's S-1 filing with the SEC, plus first-day closing prices reported by the relevant exchanges.

Amazon's S-1, filed in March 1997, disclosed $15.7 million of net sales for the prior fiscal year. The company listed in May 1997 at $18 per share, valuing the equity at roughly $438 million. Anyone who bought a single share at the open and held would now hold a stake in a company that crossed two trillion dollars in market capitalization in 2024. That return profile is not a story about Amazon. It is a story about when retail was allowed to participate.

The new IPO: arriving fully assembled

By the late 2010s, the typical large technology IPO was a different animal. The companies arriving at the public ticker arrived as already-global businesses, with revenues, valuations, and customer bases that had been built up over a long private life.

Sources: Uber, Airbnb, Coinbase, and Snowflake S-1 filings. Stripe figures from the company's investor letter and Bloomberg reporting on the 2024 tender.

Airbnb's 2017 Series F valued the company at $31 billion. Its IPO did not happen until December 2020. The three years in between contained material business growth and a global pandemic. None of that growth was available to anyone without access to a private allocation.

The pattern is consistent. Uber filed at $76 billion. Snowflake quadrupled its private valuation in the seven months between its February 2020 round and its September 2020 listing. The headline first-day pop you read about in the press is a fragment of the value created during the private years that came before it.

Where the capital went

The other half of the story is what happened to the size of the private market relative to the public one.

The SEC's Office of the Advocate for Small Business Capital Formation publishes annual reports on capital formation that break down registered versus unregistered offerings. The headline figure from the 2020 report, covering 2019 data, is that approximately 69 percent of new US capital raised that year came through unregistered (private) offerings. Approximately 31 percent came through registered (public) offerings.

That ratio inverted over the prior two decades. In the 1990s, registered offerings made up the larger share. The crossover is not a single dramatic event. It is the cumulative effect of regulatory changes (Regulation D 506(c) in 2013, the JOBS Act in 2012), the rise of large private capital pools willing to fund late-stage growth, and the operational cost of being a public company in the post-Sarbanes-Oxley era.

A few additional reference points worth bookmarking.

• CB Insights Global Unicorn Club, 2025 update: approximately $7.7 trillion in aggregate post-money valuation across more than 1,300 private companies valued above $1 billion.
• Median age at IPO for US technology companies: ~5 years in 1999, ~14 years in 2024 (Pitchbook IPO data, supported by Jay Ritter's IPO research at the University of Florida).
• Number of US public companies: ~8,000 in 1996, fewer than 4,000 in 2024 (World Bank, World Federation of Exchanges).

The shape of all three datasets is the same. Companies stay private longer. Public listings are fewer. Aggregate private value has compounded into the trillions.

Who is allowed in the room

The legal mechanism that gates retail out of private markets is Regulation D, Rule 506. Most private rounds are sold under Rule 506(b) or 506(c), both of which require investors to be "accredited" — broadly, an individual with $1M+ in net assets excluding primary residence, or $200K+ in annual income ($300K with a spouse). The SEC estimated in its 2023 report on accredited investor definitions that roughly 18.5 percent of US households now meet the accreditation thresholds, up from about 1.8 percent when the rule was originally drafted in 1982. The rule has not been indexed to inflation. The pool has grown by default.

That sounds inclusive. It is not. Even among accredited households, access to a specific private round still depends on an introduction to the General Partner running it. The introduction is the real gate. The legal threshold is the floor under the gate.

Why the lockup is the bigger problem

Even where access exists, the structural problem remains: capital committed to a private vehicle has historically been locked up for the life of the fund, typically ten years with two one-year extensions. An LP who needs liquidity before then has limited options. They can negotiate a bilateral secondary sale (slow, opaque, and typically heavily discounted). They can wait. Or they can simply not invest in the first place.

The secondary market for limited-partnership interests has grown significantly over the last decade. Greenhill's 2024 secondary market review pegged total secondary transaction volume at approximately $135 billion in 2024, up from roughly $25 billion a decade earlier. That is real institutional activity, but it remains an institutional market. The minimums, the relationships, and the bilateral negotiation cost lock individual LPs out of the same liquidity channel.

What has been absent until recently is a credible, GP-approved secondary venue that operates at the size of an individual position. That is the gap that platform-led private markets are now starting to close.

The bottom line

Three numbers summarize the shift:

1. 14 years. The median time from founding to IPO for a US technology company in 2024, roughly triple the late-1990s figure.
2. 69 percent. The share of US capital raised through unregistered private offerings in 2019, per the SEC's own data.
3. $7.7 trillion. The aggregate post-money valuation of private unicorns as of the 2025 update of the CB Insights Global Unicorn Club.

Together, those three figures describe a market where the value creation phase has migrated almost entirely into private vehicles, where the IPO no longer functions as the on-ramp for retail, and where the structural lockup of private capital is the next bottleneck to clear.

The sources behind each of these numbers are publicly available. We have tried to link to them directly so this piece can serve as a reference rather than a one-time read. If a number here gets revised in a future SEC report or unicorn count, the directional argument does not change. The IPO is no longer where retail meets growth. The next question is what does.