Covenant Lite #44: The Interval Fund That Ate the Market

Cliffwater wasn’t supposed to become a private credit powerhouse. For years, it was known as a consulting firm with good research, smart people, and a respected middle-market index. But in 2019, the firm made a bet: that RIAs would adopt private credit the way institutions did a decade earlier.

The firm launched their inaugural interval fund, the Cliffwater Corporate Lending Fund (“CCLFX”), to little fanfare in 2019. Six years later, Cliffwater’s interval fund has become the category standard with over $32B in AUM.

Its growth has been mindboggling, growing at a >100% CAGR since 2019 on its initial $50M in seed capital.

When Cliffwater launched CCLFX in 2019, interval funds were not a well known financial asset class. Most wealth advisors didn’t understand the structure. Most compliance teams didn’t trust it. And most alternatives distributors assumed that private credit, especially institutional-style, sponsor-backed direct lending, would never scale inside a 1940 Act wrapper.

But Cliffwater was at a strategic crossroads as a business and needed to do something aggressive to stay relevant. Their institutional consulting business was still healthy, but the hedge fund era that fueled much of its early client work was fading.

In the mid 2010s, Cliffwater began to shift their focus to private credit. In 2015, the firm launched the Cliffwater Direct Lending Index (“CDLI”), the first systematic, independently verified benchmark of middle market private loan performance.

It aggregated thousands of loans from dozens of lenders, normalized reporting, and translated the private credit universe into something institutions could compare to high-yield, bank loans, and other spread assets.

It also made Cliffwater the data authority in private credit. Pension funds, endowments and insurers began hiring Cliffwater specifically for private credit program design, underwriting and manager selection.

By the time CCLFX launched in 2019, Cliffwater had already completed its internal pivot. The interval fund was the commercialization of five years of accumulated expertise.

The gap in the market it saw was fairly straightforward: while institutions were already deep in the asset class, RIAs were not. It saw an open lane to industrialize institutional direct lending for advisors by using a wrapper that made their lives easy.

For decades, interval funds were the sleepy corner of the ’40 Act universe: obscure, operationally complex, and rarely used for mainstream portfolio construction. But they offered a unique combination RIAs had never been able to get from private credit:

• Daily subscriptions (no capital calls, no pacing)

• Quarterly redemptions (a predictable liquidity grid rather than a hard lockup)

• Straightforward tax reporting (1099s instead of K-1s)

• Broad distribution access through custodians

• No accreditation requirement if the fund didn’t charge a performance fee

The structure eliminated the operational friction that prevented advisors from accessing private credit, while still allowing the fund to hold the same assets middle-market lenders were originating for institutions.

The other smart thing that Cliffwater did was to embrace a multi-lender architecture. Rather than originate loans themselves or build a traditional BDC, Cliffwater created a network of leading private lenders whose loans, co-investments, and portfolio vehicles could be accessed at scale.

Cliffwater already had relationships with the vast majority of private credit GPs from its consulting work. It offered to invest in a GP’s fund (often at standard management and performance fees) to access discounted coinvestments.

This supercharged origination since they could source loans from a wide variety of private credit GPs. It also enabled index-scale diversification for CCLFX. While a typical public BDC or single manager interval fund might hold 100-150 loans, CCLFX today holds 4,000+ underlying positions.

This level of diversification makes the fund a representative slice of the U.S. middle-market lending universe: effectively private credit beta. No individual borrower matters. No single manager matters.

As of June 30, 2025, the portfolio looks as follows (Total Size = $37B because the portfolio is leveraged; NAV = $32B):

The Senior Secured Loans category is the largest category, representing almost 2/3 of the fund. These are individual loans sourced as coinvestments from the underlying GP relationships.

Over time, this ratio of 2/3 coinvestments to 1/3 fund allocations has mostly held:

After Senior Secured Loans, Private Investment Vehicles is the next largest category and represents commitments to third party funds. Often these are custom origination vehicles that Cliffwater has structured alongside the external GP. The most common vehicle type is actually Private CLO vehicles, which are 61% of the Private Investment Vehicles category.

Cliffwater likely favors these types of vehicles because they offer immediate deployment (as opposed to the uncertainty of a capital commitment to a regular fund). They are also leveraged 3-4x, which enhances returns. Cliffwater has large relationships with groups like BlackRock, Antares and Varagon via these private CLO vehicles.

The next largest allocation within private investment vehicles is Non-Listed BDCs, where CCLFX allocates to funds like Barings Private Capital Corporation ($919M), Golub Capital Private Credit Fund ($203M), and Blue Owl Credit Income Corp. ($153M).

Cliffwater’s ascent is one of the more unlikely success stories in private credit. A firm once known primarily for research, benchmarking, and consulting has, in six short years, built one of the largest capital deployment machines in the entire asset class.

Cliffwater made an early bet that private credit’s next phase of growth would not come from institutions, but from the advisor market. They pioneered use of the interval fund wrapper to make the asset class turnkey for the wealth market.

The interval fund wrapper solved the operational bottlenecks that had kept RIAs on the sidelines. The multi-lender architecture transformed Cliffwater’s consulting Rolodex into a scaled origination engine. And the use of private CLO vehicles ensured that inflows could be deployed immediately into diversified, senior-secured, institutionally underwritten credit risk, something no other wealth-channel vehicle had been able to replicate at this scale.

Today, with the largest private credit interval fund in the world, Cliffwater has effectively industrialized access to private credit beta.