What Is a Collateralized Fund Obligation (CFO)? Star Mountain's $5 Billion Deal Explained

On August 4, 2026, Star Mountain Capital closed Star Mountain CFO I, a rated securitization backed by its portfolio of lower-middle-market private credit investments. Star Mountain manages roughly $5 billion in committed capital, including debt facilities, as of July 31, 2026, according to the Business Wire announcement. Evercore ran the process. If you have never heard the term "collateralized fund obligation," you are not alone. It is a niche corner of structured finance that is quietly becoming a bigger on-ramp for insurance company money into private credit. A CFO, in plain terms, is a bond backed not by a pool of individual loans, but by a slice of a fund's LP (limited partner) interests, the ownership stakes investors hold in a private fund. Investors buy tranches of that bond instead of committing directly to the fund itself. Let's break down how that works, why it matters, and what it means if you are an accredited investor thinking about credit-fund exposure.

What a CFO Actually Is, and How It Differs From a CLO

You have probably heard of a CLO, a collateralized loan obligation. A CLO manager buys a pool of 150 to 250 broadly syndicated corporate loans, pools the cash flows, and sells investors tranches of debt and equity backed by that pool. The loans are individually rated, priced daily by dealers, and relatively easy to value. A CFO borrows the same securitization mechanics but points them at a different asset: fund interests rather than loans.

In a CFO, the sponsor, Star Mountain in this case, contributes LP stakes in its own private credit funds (or sometimes a diversified basket of third-party fund stakes) into a special purpose vehicle. That vehicle then issues debt and equity tranches backed by the cash flows those fund interests are expected to generate: interest payments, fee income, and eventual distributions as underlying portfolio companies repay their loans. Kroll Bond Rating Agency (KBRA) rates the debt tranches, which lets insurance companies, pension funds, and other regulated buyers hold the paper at favorable capital charges instead of treating it as an illiquid alternative asset.

The key difference from a CLO comes down to what sits underneath. Loans in a CLO have contractual coupons, maturities, and secondary market prices. According to S&P Global Ratings' overview of CLO structures, of more than 12,500 rated CLO tranches issued over the years, only 40 have ever defaulted, and not a single AAA tranche among them. That track record exists because a CLO manager is underwriting a diversified pool of 150-plus individual, separately rated loans. A CFO looks different. Fund interests in a CFO are equity-like claims on a private, often multi-strategy portfolio that a manager controls with discretion over reinvestment, follow-on financings, and exit timing. That makes CFOs structurally harder to rate and diligence than CLOs. Rating agencies have to model not just default risk on the underlying loans inside the fund, but the manager's track record, fund governance, valuation practices, and the timing mismatch between when the fund actually realizes cash and when the CFO needs to pay its noteholders.

The Tranche Structure: Who Gets Paid First, and Who Takes the First Loss

CFOs are built in layers, called tranches, stacked by seniority. Cash flows from the underlying fund interests waterfall from the top down: senior tranche holders get paid first, then mezzanine, then equity holders take whatever is left, positive or negative. Two structures exist for how investors buy in. A "vertical strip" investor buys a proportional slice of every tranche, top to bottom, essentially matching the whole capital structure's risk and return. A "horizontal strip" investor instead buys the entire equity tranche, or a chunk of one or two adjacent tranches, concentrating exposure at a specific point in the risk stack. Sponsors like Star Mountain typically retain a horizontal strip in the equity tranche to keep skin in the game and align incentives with the rated debt buyers above them.

Insurance companies are the natural buyer of the senior, investment-grade-rated tranches. Under National Association of Insurance Commissioners (NAIC) risk-based capital rules, an insurer's capital charge for holding an asset depends heavily on its credit rating, and regulators use four intervention thresholds, 300%, 200%, 100%, and 70% of required capital, to decide how much scrutiny a company faces. A direct LP stake in a private credit fund gets treated like an illiquid equity investment, carrying a punitive capital charge. A KBRA-rated AAA or AA tranche of a CFO backed by that same pool of loans can qualify for a far lower capital charge, similar to investment-grade corporate bonds. That rating arbitrage, more than anything else, is what has pulled billions of insurance dollars toward CFO issuance over the past several years.

A Simplified Example Tranche Structure

Every CFO deal is custom, and Star Mountain has not published its full tranche breakdown publicly as of this writing. But here is a simplified, illustrative structure showing how a typical CFO backed by lower-middle-market private credit funds might be sized and rated:

Tranche	Approx. % of Capital Stack	Illustrative Rating	Risk Profile
Senior (Class A)	55%-65%	AAA / AA	First to get paid, last to absorb losses; typical buyer is an insurance company or bank treasury desk
Mezzanine (Class B/C)	15%-25%	A / BBB	Subordinated to senior notes; absorbs losses after equity is wiped out; targets insurers and credit funds reaching for yield
Equity / First-Loss	15%-25%	Unrated	Absorbs the first dollar of loss; typically retained by the fund sponsor as a horizontal strip; highest potential return

Notice the leverage embedded here. Historically, CFO structures have run 50% to 75% leverage against the net asset value of the underlying fund portfolio, meaning debt tranches make up half to three-quarters of the total structure. That leverage is what turns a modest-yielding pool of private loans into a structure that can pay senior noteholders an investment-grade coupon while still leaving enough residual return for the equity holder to justify taking first-loss risk.

Why CFOs Are Becoming a Bigger Tool for Private Credit Managers

The private credit market now exceeds $2.6 trillion globally, a figure consistent with Brookfield's analysis of Preqin data projecting private credit assets under management climbing toward $2.64 trillion by 2029. Insurance companies have roughly doubled their private credit holdings over the past seven years to approximately $2 trillion, based on analysis compiled by BriefGlance.com. That is an enormous, structurally captive pool of capital, and it has one big constraint: insurers answer to state regulators and rating agencies that care intensely about the credit quality label on every asset on the balance sheet. A private credit manager who wants a piece of that $2 trillion cannot just ask an insurer to write a check into an illiquid fund. The insurer's own capital rules make that expensive. A CFO solves the problem by converting fund exposure into a rated, tradable-on-paper instrument that fits neatly into an insurance general account.

KBRA has rated 152 tranches across 67 CFOs issued between 2018 and 2024, totaling about $37.7 billion in issuance, of which roughly $28.5 billion was rated debt, according to KBRA's March 2025 research on CFO growth and performance. That is not a niche experiment anymore. It is a repeatable financing tool that fund sponsors are turning to as a permanent-capital-style solution. For a manager like Star Mountain, which focuses on the lower middle market (companies generally too small for the broadly syndicated loan market and too large for a community bank line), a CFO offers a way to term out financing against a seasoned pool of loans without having to sell the underlying positions or ask existing LPs to fund a continuation vehicle.

For institutional LPs and allocators, the practical effect is this: CFO issuance is pulling insurance capital deeper into private credit, faster than it would move through traditional fund commitments alone. That has two implications worth sitting with. First, it adds a new source of demand for private credit assets, which can support valuations and tighten spreads across the space, good news if you already hold exposure. Second, it means more of the private credit market's ultimate risk is being repackaged and distributed to buyers who may not fully appreciate that a CFO tranche, even a highly rated one, is not the same animal as a corporate bond with the same letter grade. CFOs are younger structures, thinner on historical stress-test data, and dependent on a single manager's underwriting discipline across the whole underlying portfolio.

What Could Go Wrong: Correlation Risk and Structural Leverage

A CFO is not a magic trick that erases risk; it redistributes it. Here is where the real exposure sits. First, correlation risk. A CLO's 150-plus loans typically span dozens of industries and often several original lenders, so one bad sector does not sink the whole pool. A CFO backed by a single manager's fund or funds is a different animal: the underlying portfolio companies were all underwritten by the same team, using the same credit process, often concentrated in similar deal sizes and, sometimes, similar sectors. If that manager's underwriting has a blind spot, a recession or a sector-specific shock can hit a much larger share of the portfolio at once than a diversified CLO would experience. Rating agencies try to model this, but CFO performance data only goes back to the early 2000s with a long gap where zero deals were issued between 2007 and 2013, according to Mayer Brown's legal analysis of the CFO market. That gap exists because the 2008 financial crisis exposed exactly this kind of concentrated, leveraged structure as fragile when liquidity disappeared and valuations became guesswork.

Second, structural leverage. Remember that 50% to 75% leverage ratio in the example table above. Leverage magnifies gains for the equity tranche in good years and magnifies losses just as fast when the underlying fund's net asset value comes under pressure. If underlying portfolio companies start missing interest payments or requiring covenant relief, the equity tranche can be wiped out quickly, and mezzanine holders can start absorbing losses well before anyone expected. Because private fund interests do not trade on an exchange, valuation marks come from the manager itself or a third-party valuation firm working off the manager's models, not a market clearing price. That introduces a lag: problems inside the portfolio can take quarters to show up in the numbers that feed the CFO's reported performance.

Third, liquidity mismatch. Even senior, rated tranches of a CFO are far less liquid than a public bond of the same rating. There is no deep secondary market for CFO notes the way there is for CLO tranches. If you need to sell before maturity, you may find few buyers and a wide bid-ask spread, especially during a period of market stress, which is exactly when you are most likely to want out.

The Takeaway for Accredited Investors

Most accredited investors reading this will not buy a CFO tranche directly; that market is built for insurance companies, banks, and large institutional credit funds writing checks in the tens of millions. But CFO issuance still matters to you if you hold, or are considering, exposure to private credit funds, business development companies (BDCs), or interval funds that invest in direct lending. A manager's ability to issue a CFO against its own fund portfolio is a signal of institutional-grade infrastructure: it means the manager's loan book, valuation practices, and reporting are rigorous enough to survive a rating agency's diligence process. That is a genuinely useful data point when you are choosing between private credit managers, alongside track record, default history, and fee structure.

The flip side: do not assume that because a big, sophisticated buyer like an insurance company is willing to hold a AAA-rated CFO tranche, the underlying private credit strategy itself is low risk. The insurer bought protection through seniority and structure, not because the underlying loans are safe. If you are evaluating a fund that has issued or plans to issue a CFO, ask direct questions: What is the sector and borrower concentration in the underlying portfolio? How much leverage sits in the CFO structure? Who holds the equity tranche, and is the manager retaining meaningful skin in the game there? What happens to your fund interest, and your reporting, if the CFO needs to be refinanced or unwound? A manager confident in its underwriting will answer these plainly. One that gets vague about concentration or leverage numbers is telling you something too.

Private credit is not going away, and structures like CFOs are how that market is going to keep pulling in institutional capital at scale. Understanding the mechanics gives you a sharper set of questions to ask before you commit capital, whether directly to a fund or through a vehicle that has this kind of financing sitting underneath it. For more background, see the Wikipedia overview of CFO structures, which traces the mechanism back to early precedents like Temasek Holdings' 2006 CFO and SVG Capital's Diamond program.

Author Disclosure: Jeff Barnes, MBA has no personal position in any company, fund, or platform named in this article. Angel Investors Network has no current commercial relationship with any party mentioned. AIN provides marketing and education services, not investment advice. Past performance does not guarantee future results. All investments involve risk, including loss of principal.