Private debt, through an institution's eyes.
Since the financial crisis, banks have retreated from lending and private credit has filled the gap — growing at roughly a 25% annual rate toward a projected $3 trillion by 2028. This guide builds the intuition from the ground up: what private equity is, how lending to private companies differs, and exactly why pensions and insurers keep raising their allocations.
Start with private equity →What is private debt — and why advisors are paying attention
Private debt — also called private credit or direct lending — is the business of lending money directly to private companies, rather than buying their shares or trading their bonds on a public market. A private-debt fund originates loans, collects interest while the loan is outstanding, and is repaid the principal at maturity. The investor's return comes mainly from contractual interest income, not from price appreciation.
The asset class has grown from a post-2008 niche into a market of roughly $1.6–1.7 trillion in assets under management. As banks pulled back from mid-market lending, private-credit managers stepped in — and institutional investors such as pensions, insurers and endowments now treat the asset class as a core source of yield, diversification and floating-rate income.
This guide explains private debt from first principles for financial advisors and allocators. It begins with private equity — because understanding ownership makes lending easy to grasp — then walks through how private debt differs, the main strategies (senior direct lending, unitranche, mezzanine, distressed, asset-based and real-estate debt), the risk-return trade-off, the case for allocating, the mechanics of fees and the J-curve, and the real risks involved.
How does private debt differ from private equity?
Private equity owns companies and earns whatever is left after lenders are paid — high upside, high risk, returns realised on exit. Private debt lends to those same companies from a senior, secured position — earning steady interest that is paid ahead of equity, usually with collateral and covenants behind it.
Why do institutional investors allocate to private debt?
Because committed, illiquid capital is paid an illiquidity premium — historically a few percentage points of extra yield over comparable public credit. Most loans float with base rates, so income rises as rates rise, and seniority plus collateral cushions losses if a borrower struggles. For an investor who doesn't need daily liquidity on that slice of capital, it can be paid to wait.
What this guide covers
Eight chapters · ~18 minPrivate equity is about owning companies you can't buy on an exchange.
A private-equity fund pools capital from investors to buy whole businesses — usually mature, profitable companies — improve them over several years, and sell them at a profit. Because the shares aren't publicly traded, the fund has control and a long runway to make changes.
Two roles define every fund. The General Partner (GP) is the manager: it sources deals, makes investment decisions and runs the companies. The Limited Partners (LPs) — pensions, endowments, insurers and, increasingly, private-wealth clients — supply the capital and share the profits.
A fund typically lives 10 years or more. Capital goes out slowly and comes back later — which is why returns are measured as an IRR (an annualised rate that accounts for timing) and a multiple (total dollars back per dollar in, e.g. 2.0×).
Equity sits at the bottom of the capital structure. It earns whatever is left after everyone else is paid — so the upside is large, but so is the risk. Private debt is the mirror image: lending to these same companies instead of owning them.
Private debt is being the lender — not the owner.
Private debt — or private credit — is non-bank lending to private, mid-market companies, typically those with revenues of $10–100 million. Funds negotiate loans directly with borrowers, collect interest, and are repaid at maturity. Because it's a bilateral, buy-and-hold arrangement, it's often called direct lending.
That single change — lending instead of owning — reshapes the return profile. Income arrives from day one, most loans are senior and secured with a first claim on assets, and rates usually float, so income rises when base rates rise. Cliffwater has called it an "all-weather" asset class for its resilience across cycles.
Compare the three
Private equity aims highest, but private debt captured ~9.5% a year over 2004–23 from a senior, contractual position — equity-like return without owning the equity (Cliffwater).
Figures: Cliffwater, S&P, Cambridge Associates — via Nakashe (2025).
Seniority decides almost everything.
Where a strategy sits in the capital structure sets its return — and its recovery if things go wrong. S&P's 2003–21 data shows first-lien loans recovering ~72% of value, versus ~34% for second lien and ~39% for mezzanine. Here's the same business, financed in layers:
More return than bonds, less reported risk than equity.
Over 2004–23 the Cliffwater Direct Lending Index returned 9.46% at a 2.9% standard deviation — beating U.S. Aggregate bonds (3.12%) and rivalling equity returns, with far lower marked volatility. Click any point to read about it.
Direct lending (Cliffwater Direct Lending Index): 9.46% return at just 2.9% standard deviation over 2004–23 — equity-like income, credit-like reported risk. Caution: appraisal-based marks understate true volatility.
Source: Cliffwater, Morningstar Direct, S&P (2004–2023) — via Nakashe (2025).
A caution the paper stresses: private-asset volatility is understated because valuations are appraisal-based and lag the market rather than marked daily. The true economic risk is higher than the reported standard deviation suggests.
Why a pension or insurer gives up liquidity for this.
The central trade is the illiquidity premium: because the loans can't be sold daily, borrowers pay extra for committed capital. Cliffwater finds investors capture roughly 4% of added net-of-fee return — 7.23% versus 3.31% for public credit — for paying about 1% more in cost.
For a long-horizon institution that doesn't need daily access to that slice of capital, it can be paid to wait.
credit
(net, unlevered)
Private debt yields roughly 200 bps above broadly syndicated loans, and 200–300 bps over liquid fixed income (Pitchbook; Cambridge Associates).
Standard deviation of ~2.9% versus 6.5% for leveraged loans — partly real (seniority, covenants), partly smoothed valuations (Cliffwater).
Stable, floating-rate cash flows match long-dated liabilities and beat inflation — a fit reinforced by IFRS 17. The 2022 UK LDI crisis is the cautionary counterweight.
Smaller middle-market loans have defaulted at nearly one-third the rate of larger loans, with first-lien recovery near 70% (S&P, 1995–2018).
Low correlation to public markets — the "barbell" strategy of pairing safe, liquid assets with higher-yielding private credit.
Solvency II reforms and the U.S. NAIC framework lower capital charges on rated private debt, lifting insurers' risk-adjusted return on capital.
internal rating)
corporate bonds
Lower capital charges on rated private debt raise return on capital for a life insurer. Source: illustrative example, Nakashe (2025).
Who allocates most
Insurers lead, then pensions. Source: Private Debt Investor, 2023.
How the money moves — and shallower J-curves.
The J-curve
Cumulative net cash to an investor, as a % of commitment. Capital goes out first (the dip), distributions come later. Because private debt pays interest early, its curve is much shallower.
Yearly cash flows
Private equity: heavy calls up front, nothing back for years, then a burst of distributions as companies are sold.
What it costs
Cliffwater's survey of 66 funds ($1.1T of direct-lending assets) puts the all-in cost at 4.12% of NAV:
Carry typically runs 10–15% over a hurdle — richer than public credit, so always compare returns net of fees. Source: Cliffwater fee survey, 2024.
Tenor & vintages
Returns vary by the year a fund starts. Committing across vintages — not all at once — smooths the experience.
What keeps allocators up at night.
The same features that make private debt attractive create real risks. The IMF and IOSCO have both flagged the market's opacity, leverage and untested behaviour in a downturn. The honest case requires holding both sides.
No secondary market to speak of. Forced sales of LP stakes priced at 5–20% below NAV, and near 30% in a crisis — 2022 cleared around 77% of NAV (Jefferies).
Borrowers can defer cash interest by rolling it into principal. A PIK amendment often signals distress — masking problems and stacking up credit risk.
All-in costs far exceed liquid fixed income. For schemes under fee caps (e.g. the UK's 0.75%), this alone limits how much they can hold.
Higher-for-longer rates slowed M&A and deal flow. Pressure to deploy uncalled capital risks looser covenants and a "race to the bottom" on spreads.
Leverage sits at the borrower, the fund (NAV and subscription lines) and the investor. Forced deleveraging in a downturn could ripple to pensions and insurers.
No mandatory standardised reporting; valuations aren't from price discovery. Losses can surface only at maturity. AIFMD II (2026) will tighten EU disclosure.
Private debt offers a compelling risk-return profile for institutions with patient capital and the capacity to manage illiquidity — but realising the benefit hinges on manager due diligence, governance and disciplined liquidity planning. High minimums (often $10M+) keep it the preserve of larger allocators.
What would a sleeve actually generate?
Size a hypothetical allocation and compare the income against leaving the same dollars in core bonds. Defaults reflect the paper's figures — adjust the inputs.
Illustrative only. A simplified income comparison — it ignores fees beyond the net-yield input, defaults/losses, reinvestment and the J-curve's slow ramp. Private-debt capital is locked up and not redeemable on demand. Not investment advice.
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Sujit Nakashe
A finance leader with 20+ years across alternative investments — private credit, private equity and hedge funds.
This guide grew out of my Executive MBA research at Bayes Business School on why institutional investors allocate to private debt — translating two decades of fund-finance practice into a primer for advisors and allocators.
Career
alternative investments
Notes on private credit.
Shorter pieces between guide updates — market shifts, recurring questions, and corners of the asset class worth a second look.
New notes on private credit will appear here. In the meantime, you can follow along on LinkedIn.
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Content and figures adapted from "Why Private Debt is Attractive to Institutional Investors" — Sujit Nakashe, Executive MBA, Bayes Business School, City University London (2025). Underlying data: Cliffwater · S&P Global · Bain & Company · McKinsey · Preqin · PitchBook · IMF · IOSCO · Jefferies · Cambridge Associates · Private Debt Investor. Figures are illustrative and historical; not investment advice.