US Venture Capital Report 2015 — The Private Market Forms

The most consequential development in US venture capital in 2015 was not a valuation level or a funding total. It was the emergence of a durable late-stage private market — a class of companies that were large by any measure, funded by institutions that had not historically invested in private companies, and able to remain private indefinitely.

Three things made this possible, and all three were new within the preceding five years.

Capital arrived from outside venture. Mutual funds, hedge funds, sovereign wealth funds and corporate investors began taking positions in private companies at scale. These investors had far larger pools than traditional venture funds, and their comparison set was public equities rather than other private rounds.

Regulatory and structural changes removed the pressure to list. Historically, companies were compelled toward public markets partly by shareholder-count thresholds that triggered public reporting obligations. Those thresholds had been relaxed, and secondary markets in private shares had developed enough to provide employee and early-investor liquidity without a listing. The forcing mechanism weakened substantially.

Founders preferred it. Public markets impose quarterly disclosure, short-horizon scrutiny and reduced control. Given the option to fund growth privately, many founders reasonably declined the alternative.

The result was a market in which private companies could reach very substantial scale without ever being priced by anyone able to say no. The 2015 report at the global level describes this as the opening of the private-public valuation gap. This report describes the machinery that produced it.

Notably, 2015 also produced the first serious external scrutiny of private marks — not from regulators or from venture investors, but from mutual funds obliged to value their private positions monthly and publish the results. Different funds holding the same company reported materially different values. That was the first public evidence that private valuations were estimates rather than facts.

Why the pressure to list disappeared

Understanding what changed requires understanding what the old pressure actually was.

For most of the modern era, a successful private company faced accumulating pressure toward a listing:

• Shareholder count thresholds. Beyond a certain number of holders of record, a company became subject to public reporting requirements regardless of whether it had listed. Having incurred the cost of reporting, listing became the rational next step.
• Employee liquidity. Employees compensated substantially in equity need a way to realise value. Historically, an IPO was the only route.
• Investor liquidity. Venture funds have finite lives and must return capital. A ten-year fund holding a position at year nine needs an exit.
• Capital scale. Growth beyond a certain point required more capital than private markets could supply.

By 2015, each of these had weakened:

• Thresholds had been raised, and the way holders are counted had been changed, so a company could accumulate far more shareholders before triggering obligations.
• Secondary markets developed. Employees and early investors could sell shares privately, through structured tender offers or dedicated platforms, without the company listing.
• Fund lives extended in practice, through extensions and, later, continuation structures.
• Private capital scaled dramatically. Rounds that would have been impossible privately in 2005 were routine by 2015.

Remove every forcing mechanism and staying private stops being a stage a company passes through. It becomes a strategy a company can choose indefinitely — and if it can, most will.

The consequence is the one that matters for the following decade. A company that never faces a public bid never has its valuation tested. The private mark is the only mark, and it is produced by a process with no adversarial participant.

What mutual fund holdings revealed

An unusual and underappreciated source of evidence appeared in 2015, and it came from an accounting requirement rather than from market analysis.

Mutual funds holding private company shares are required to value their entire portfolio regularly — daily or monthly depending on structure — because investors buy and sell fund units at net asset value. That means a private position must be assigned a value even when no transaction has occurred, and those valuations are disclosed in public filings.

This produced something the private market had never had: multiple independent valuations of the same private company, published, on a regular schedule.

The results were informative in several ways:

• Different funds reported materially different values for the same company at the same date. Since the underlying asset was identical, the differences reflected valuation methodology rather than information.
• Marks moved between rounds, sometimes substantially, demonstrating that a private valuation need not be static between financings — and by implication, that venture funds holding at last-round price were making a choice rather than following a requirement.
• Markdowns appeared before down rounds did, in several cases by many months, showing that public-market-trained analysts were reaching different conclusions than private markets were pricing.

The general point is important and applies well beyond 2015. A private valuation is an estimate produced by a methodology, and different methodologies produce different estimates. The apparent precision of a headline valuation — a specific number, widely reported — conceals that it is one output of one process, and that reasonable alternative processes produce different numbers.

This was the first public evidence of a gap that took until 2019 to be tested properly and until 2022 to be resolved.

Terms as the hidden variable

2015 saw a divergence between headline valuations and the economics underneath them that became a defining feature of the following years.

The dynamic: a company wants to raise at a higher valuation than its performance strictly justifies, for reasons of momentum, recruiting and competitive signalling. An investor is willing to invest but not at that price on standard terms. The resolution is to agree the headline price and adjust the terms.

The instruments involved are the same ones the 2019 and 2022 reports describe, and 2015 is where their systematic use begins:

• Liquidation preference multiples above 1×, returning the investor a multiple of their capital before others receive anything.
• Participating preferred, taking the preference and then sharing pro rata in the remainder.
• Ratchets, issuing additional shares to the investor if a subsequent round or listing prices below a threshold — protecting the investor from exactly the outcome that later occurred.
• Senior preference, placing the new round ahead of all prior investors in the payout stack.

The ratchet deserves particular attention because of its role in what followed. An IPO ratchet guarantees the investor a minimum return at listing, issuing them more shares if the offer price is low. This has a specific consequence: it makes the investor indifferent to a lower listing price while making it far more damaging for everyone else. In several 2019 listings, ratchet provisions from 2015-era rounds materially affected the outcome — the protection agreed years earlier was exercised at the moment of maximum dilution.

A headline valuation is a price. The terms determine what was actually bought. In 2015 the two began to diverge systematically, and reporting continued to cover only the first.

The widening imbalance

By the end of 2015 an imbalance had formed that would take years to resolve.

The funding route had widened enormously. More capital, from more sources, available at larger scale, at every stage, with less pressure toward any particular outcome.

The exit route had narrowed. IPO volumes were subdued relative to the scale of private company formation. Large acquisitions faced increasing antitrust scrutiny in the most relevant sectors. The number of buyers capable of absorbing a multi-billion-dollar private company was small.

The mathematics of that imbalance are unforgiving and were entirely visible at the time. Capital entering the asset class must eventually leave it through an exit. If entry capacity grows and exit capacity does not, unrealised value accumulates. That accumulation is invisible while it is occurring — it looks like growth — and becomes visible only when someone needs the money back.

The 2015 cohort of large private companies is the one that came to market in 2019 and found that public markets applied a different standard. It is the same cohort whose surviving members were still being resolved in 2023 and 2024.

That is the longest causal chain in the archive, and it begins here.

What the non-traditional investors were actually buying

The entry of mutual funds, hedge funds and crossover investors into private rounds is usually described in terms of capital supply. It is more informative to ask what they thought they were buying, because the answer explains both their willingness to pay and their subsequent behaviour.

The stated rationale was access to growth occurring before the public market. Companies were listing later, so the appreciation that would historically have accrued to public investors was accruing to private ones. A public equity manager who did not participate in private rounds was, on this reasoning, systematically missing a portion of the return in their own sector.

That rationale is sound and it carried three assumptions that were not examined:

• That the pre-listing appreciation would continue to be available. This assumes the private valuation is below the eventual public one. In several cases it was above, which the 2019 report describes being discovered.
• That the position could be exited. A public manager's operating assumption is that positions are liquid. A private position is not, and the exit depends on a listing occurring — which, as this report describes, had become optional for the company rather than inevitable.
• That valuation methodology transferred. These investors valued companies against public comparables, which is a reasonable method and produces a different answer from the negotiated pricing that had governed private rounds. Importing the method imported the public market's condition into private valuations.

The behavioural consequences followed from the mismatch between their structure and the asset:

• They marked positions frequently, because their fund structures required it. That is why their marks provided the first public evidence of private valuation dispersion, and why they were often first to mark down.
• They faced redemption pressure that traditional venture funds do not. An open-ended fund experiencing outflows must meet them, and cannot meet them from an illiquid position — which creates pressure to reduce the liquid portion, or to avoid adding to the illiquid one.
• Their participation was therefore conditional on their own conditions, not on the companies'. When public markets were difficult, as in early 2016, their participation reduced regardless of how the private companies were performing.

A public equity investor buying a private position is buying an asset their structure is not built to hold. That works while conditions are favourable and produces withdrawal precisely when they are not — which means the capital is least available at the moment it is most needed.

This is the mechanism behind the stage-differentiated slowdown the 2016 report describes, and it recurs in 2022 at far greater scale. The late-stage private market's dependence on capital whose structure is mismatched to the asset is a permanent feature of it, not a phase.

What 2015 established for US venture

• A durable late-stage private market formed, with capital from investors whose discipline came from public equity but whose behaviour in private rounds did not reflect it.
• The forcing mechanisms toward listing were removed, making "stay private" a viable indefinite strategy.
• Private marks were first shown publicly to be estimates, through mutual fund disclosure.
• Terms began diverging from headline valuations, systematically and without being reported.
• The entry/exit imbalance formed, and its resolution took until 2022.

What an allocator could act on

The 2015 mechanisms translate into a small set of questions that were answerable at the time and were largely not asked.

Ask what the last round's terms were, not only its price. A headline valuation is a price for a protected security. The terms — preference multiple, participation, ratchets, seniority — determine what was actually bought and what the common shares are worth. This information is in the documents and is frequently not summarised in the materials investors receive.

Compute the implied common value. Given the preference stack and the share count, the value of the common shares at any given exit price is computable. Doing this at a range of exit values shows how much of the enterprise value the headline number is claiming and how quickly the common position is impaired. It is arithmetic and it takes minutes.

Ask when the valuation was last tested by someone who could decline. A price set by the most optimistic investor in a negotiated round has been tested by one party. A price set in a competitive process has been tested by several. A price set by a public market has been tested by everyone. These are different degrees of validation and the distinction is rarely recorded alongside the number.

Track mutual fund marks on private holdings. This was, and remains, the only public source of independent valuation for private companies. Fund portfolio filings on SEC EDGAR disclose the marks, and comparing them across funds holding the same company — or across dates for the same fund — reveals both the dispersion and the direction. It is free, it was available in 2015, and almost nobody used it.

Ask what the exit assumption is and whether the route exists. The entry/exit imbalance described above was arithmetically visible: private company formation at scale, with listing volumes and acquirer capacity not growing proportionally. An investment whose exit assumes a route with insufficient capacity is an investment with an unexamined assumption, and the capacity was countable.

Every one of these questions was answerable in 2015 from documents the investor already had or from filings that were free. None of them required a market view. The 2019 correction was, in a specific sense, the market collecting on questions that had not been asked.