Why Private Markets Are Becoming an Essential Allocation

The opportunity set public markets no longer capture, the illiquidity premium, the rise of private credit… and the risks you cannot ignore

Over the past two decades, the structure of capital markets has changed profoundly. More companies stay private for longer, banks have retreated from much of the middle-market lending they once dominated, and institutional investors have steadily increased their exposure to private assets.

Today, managers such as BlackRock, Apollo, Morgan Stanley, J.P. Morgan and Partners Group converge on a single message: private markets are no longer a satellite holding — they are an increasingly central allocation.

What follows are the main arguments backed by data, the most recent evidence on why the return regime has changed, and an honest look at the risks. Because this is not all upside.

1. The opportunity set has shifted to private

One of the most revealing data points comes from BlackRock: 81% of US companies with revenues above $100 million are private. The same research notes that since 1980, the number of US private companies has grown 29% while public companies have declined 32%.

This means much of the corporate value creation happening today — particularly in technology, healthcare, industrials and services — occurs outside the listed markets. An investor confined to public equities is excluding the majority of the meaningfully sized company universe.

Compounding this is a concentration problem on the public side: according to BlackRock, the 20 largest names now represent more than 30% of global stock market capitalization as of 2024, up from just under 14% in 2015. The public market has not only shrunk in issuer count — it has become considerably more concentrated.

2. The illiquidity premium

The classic argument — and still a valid one — is that accepting less liquidity and longer horizons has historically been compensated with higher returns.

In private credit, the figure is measurable: according to T. Rowe Price, since 2019 private credit new-issue spreads have been 150 to 340 basis points wider than comparable broadly syndicated loan (BSL) new-issue spreads, and that premium persisted with base rates ranging from 0% to 5.3%. It was not an artifact of a single rate regime.

That premium has two components worth separating:

• Compensation for illiquidity — the capital cannot be moved.

• Compensation for complexity — structuring, covenants, and a direct relationship with the borrower.

The second is what a good manager can capture better than a mediocre one. The first is collected by anyone willing to lock up capital.

3. Genuine diversification and lower correlation

Unlike public equities and bonds — increasingly correlated with one another — private markets offer a return stream with lower correlation to listed markets.

Partners Group and J.P. Morgan emphasize that private valuations tend to reflect business fundamentals (cash flow, margins, growth) more than short-term market noise. But precision matters here: part of that lower volatility is real and part of it is an accounting artifact, because valuations are not struck daily. We return to this in the risk section.

4. The structural rise of private credit

Private credit has been the fastest-growing segment within private markets. Size estimates vary by source, and it is worth understanding why:

Source	Estimated size	Definition / date
Financial Stability Board	$1.5–2.0 trillion	Direct lending focus, end-2024
BlackRock (Private Markets Outlook 2026)	$1.9 trillion	Private credit ecosystem
Morgan Stanley	$3 trillion	Broad definition, start of 2025
Morgan Stanley (projection)	~$5 trillion	Estimated for 2029

The structural driver is clear: bank participation in the leveraged loan market has fallen sharply, with non-bank lenders going from a 28% share in 1994 to 86% in 2023, per BlackRock. This is not a product fad — it is a reallocation of who finances the real economy.

In its Private Markets Outlook 2026, BlackRock also describes a deeper shift it calls "the new continuum": the boundary between public and private is becoming less rigid as data transparency improves and semi-liquid structures proliferate (evergreen vehicles, ELTIFs, LTAFs, model portfolios).

5. Active value creation

Unlike index investing, private equity and private credit managers can influence portfolio companies directly: operational improvements, capital structure optimization, closer governance and origination discipline. Brown Brothers Harriman and Partners Group highlight this capability as the single most important differentiator versus public markets.

And as we will see, this is precisely the variable that matters most in the current environment.

6. The regime has changed: Apollo's six considerations

In June 2026, Apollo published a short but pointed piece — Private Equity: Six Key Considerations for Investors — worth summarizing, because it does not merely defend the asset class. It explains why the rules changed.

a) The performance edge is long-term, not cyclical. Per Apollo's analysis of Preqin data, private equity has outperformed public equity in 97 of 100 quarters on a rolling 10-year basis (MSCI Private Capital Solutions Private Equity Index vs. Russell 3000, 5- and 10-year windows from 2000 through 2024). That track record spans multiple cycles and rate environments.

b) Private equity is not a monolithic asset class. In public equities, the fundamental distinctions are market cap and sector. In private markets, what matters is fund size, strategy and sector focus. And the key data point: return dispersion in private equity is nearly 30%, versus just 2% in public equity (PitchBook, 20-year IRRs for vintage-year funds 2005–2019, as of March 2025). Translated: in public markets, picking the wrong manager costs you points. In private markets, it costs you the entire thesis. Manager selection is not an implementation detail — it is the decision.

c) The regime has changed. Between 2010 and 2022, 59% of buyout deal returns came from leverage and multiple expansion (McKinsey, Global Private Markets Report 2026). More than half the return came from tailwinds — falling rates, abundant credit, expanding multiples — that rewarded participation over skill. That backdrop is gone. With structurally higher rates, returns have to be earned.

d) Scale and platform matter more than they used to. The middle market was long synonymous with superior returns, but as the segment grew crowded, the structural advantages at the lower end became harder to find. Apollo notes that the number of private equity funds has declined for four consecutive years since the 2021 peak, including a ~23% drop in buyout funds in 2025 (Bain, Global Private Equity Report 2026): capital is concentrating in fewer, larger managers.

e) Operational value creation takes center stage. With borrowing costs in the 8–9% range and entry multiples still elevated, the arithmetic has changed: a typical buyout now requires 10–12% EBITDA growth to reach the same ~2.5x return that once required roughly 5% (Bain, 2026). Doubling the operational hurdle is not a minor adjustment — it is a filter separating managers with genuine operating teams from those who only structure.

f) The DPI drought forces a rethink of liquidity. Distribution yields have fallen and hold periods have extended. The private equity industry is sitting on roughly $3.8 trillion of unsold portfolio companies — more than the GDP of the United Kingdom (Bain, 2026; UK 2024 GDP was $3.69 trillion per the World Bank). The industry's answer is secondaries, continuation vehicles and structured liquidity solutions. For the investor, the practical read is different: DPI — capital actually returned — matters more than reported NAV.

The risks (and how to manage them)

No serious private markets allocation can ignore the structural risks. And it is worth being direct: in May 2026 the Financial Stability Board published a report on vulnerabilities in private credit that is nobody's marketing document.

Its main findings: private credit borrowers have lower credit quality and higher leverage than comparable public market borrowers; most lack a public rating, with growing reliance on private ratings from lesser-known providers; opaque, multi-layered structures obscure true leverage; direct bank exposure sits at roughly $220 billion in drawn and undrawn credit lines (commercial estimates run to $270–500 billion); and redemption options in semi-liquid funds may amplify procyclicality in stress episodes.

None of this invalidates the thesis. It does require building the exposure with eyes open.

Risk	Description	How to manage it
Illiquidity	Capital can be locked up 7–12 years in traditional funds. A secondary market exists, but typically trades at a discount.	Evergreen or semi-liquid vehicles, pairing with secondaries, planning commitment pacing, and holding adequate liquidity at the total-portfolio level.
Manager selection	Dispersion between top and bottom quartile is nearly 30% (vs. 2% in public equity). This is the dominant risk.	Rigorous due diligence, genuine access to top-tier managers, net-of-fee track record, team stability and incentive alignment.
Valuation	Valuations are not daily, are model-based, and can be stale or optimistic. The FSB also flags opacity in private ratings.	Focus on realized returns (DPI), not just NAV; diversify by vintage; favor managers with conservative valuation policies and independent verification.
J-curve and capital calls	Early years are typically negative due to fees and slow deployment. Capital calls arrive at inconvenient moments.	Model cash flows realistically, avoid over-commitment, and pair drawdown funds with evergreen structures that deploy immediately.
Credit and default	Defaults rise in slowdowns, particularly where borrower leverage is high.	Favor senior secured positions, strong covenants, sector diversification, and managers with proven origination and monitoring capability.
Fees and complexity	"2 and 20" structures plus additional expenses erode net returns.	Always evaluate returns net of fees; consider co-investments (typically lower fees); negotiate terms where size permits.
Concentration and leverage	Many portfolio companies carry leverage, and funds may concentrate in few sectors or geographies.	Diversify across strategy (PE, credit, infrastructure), sector, geography and vintage year.
Systemic risk / interconnectedness	Meaningful bank exposure and opaque structures can amplify stress (FSB, May 2026).	Size the total allocation deliberately, avoid overexposure to a single manager or strategy, and monitor fund-level leverage.

The general principle: illiquidity and complexity are not eliminated — they are managed. The most successful private markets investors do not try to avoid these risks; they size them correctly within the total portfolio, with a long-term horizon and high-quality manager selection.

Conclusion

Private markets are not a fad. They reflect a structural change in how the real economy is financed and grows: fewer listed companies, more non-bank financing, and a growing share of value creation happening off-exchange.

But the important conclusion for 2026 is not "you should be in private markets." It is more demanding than that. With 59% of historical buyout returns explained by tailwinds that no longer blow, with the operational growth hurdle roughly doubled, and with nearly 30% return dispersion between managers, the question is no longer whether to allocate — it is with whom and how.

For a diversified portfolio, private markets are arguably the clearest remaining path to raising expected returns. But it is a path that charges a toll: illiquidity, complexity, fees, and a critical dependence on manager quality. Anyone who cannot tolerate that toll should not buy the ticket.

As always, a private markets allocation should be evaluated in the context of the total portfolio, the time horizon, and the genuine capacity — financial and emotional — to tolerate illiquidity.

This content is for informational and educational purposes only. It does not constitute investment advice, an offer, or a recommendation to buy or sell any security, and it does not take into account the objectives, financial situation or particular needs of any investor. Alternative investments involve significant risks, including the possible loss of the entire principal, are illiquid, and are suitable only for qualified investors with long-term horizons. Past performance does not guarantee future results.

Sources

• Apollo Global Management — Private Equity: Six Key Considerations for Investors (June 2026)

• BlackRock — What Are Private Markets & How to Invest

• BlackRock — 2026 Private Markets Outlook: A New Continuum

• Morgan Stanley — Private Credit Outlook: Estimated $5 Trillion Market by 2029

• Morgan Stanley Investment Management — Alts In Focus: 2026 Outlook — Private Credit

• T. Rowe Price — Private Credit's Persistent Premium

• Financial Stability Board — Report on Vulnerabilities in Private Credit (6 May 2026)

• Bain & Company — Global Private Equity Report 2026 (via Apollo)

• McKinsey & Company — Global Private Markets Report 2026 (via Apollo)

• PitchBook, Preqin, MSCI Private Capital Solutions and Morningstar — dispersion and comparative performance data (via Apollo)

• Partners Group — Why invest in Private Markets

• Brown Brothers Harriman — Investing in private markets