Traditional leveraged buyout financing involves multiple layers of debt — senior secured, second lien, mezzanine — each with different lenders, different terms, and different intercreditor agreements governing their rights relative to one another. The unitranche facility replaces this complexity with a single loan from a single (or small group of) lender(s), at a blended rate. It has transformed mid-market leveraged lending over the past decade.
The traditional multi-tranche structure
In a classic leveraged buyout financing, a £200 million deal might be structured with: £120 million of senior secured term loan at SOFR + 4.5%, £40 million of second lien debt at SOFR + 8.0%, and £20 million of mezzanine at 12% (part cash, part PIK). Each tranche has its own lender group, its own security package, and an intercreditor agreement determining who gets paid first in a restructuring. The borrower manages three lender relationships, three sets of documentation, and three sets of reporting obligations.
The blended rate and who benefits
A unitranche rate is set between what pure senior and pure mezzanine would individually cost — typically SOFR + 5.5–7.5% in the current market for mid-market transactions. This means the borrower pays more than it would on pure senior debt, but less than the blended cost of a multi-tranche structure.
The direct lending fund providing the unitranche earns a higher yield than it would on pure senior debt, in exchange for taking on junior credit risk on a portion of the exposure. Because the entire facility sits in one instrument with one set of rights, the lender avoids the inter-creditor negotiation and enforcement complexity that plagues multi-tranche restructurings.
The "agreement among lenders" (AAL)
When a unitranche loan involves multiple direct lenders (a lending club), the lenders structure their relative rights through a private agreement among lenders (AAL) — sometimes called a "super senior/first out / last out" structure. Internally, one lender takes the first-out (lower risk, lower yield) tranche and another takes the last-out (higher risk, higher yield) tranche. From the borrower's perspective, there is still a single loan with a single rate; the internal risk allocation between lenders is invisible and governed by the AAL.
Unitranche vs syndicated markets: the trade-off
The unitranche market's advantage is speed, flexibility, and certainty. A direct lender can commit to and close a £200 million unitranche in 4–6 weeks with minimal documentation risk. A broadly syndicated leveraged loan of the same size requires road shows, rating agency processes, underwriting risk management, and 10–14 weeks minimum. In competitive auction processes where deal certainty matters as much as price, unitranche often wins even when its all-in cost is slightly higher than a syndicated alternative.
The syndicated market's advantage is scale and, in favourable conditions, lower cost. For larger transactions and borrowers with strong ratings, the liquid public market can provide capital at tighter spreads than a direct lender willing to hold £500 million in a single credit. The choice between unitranche and syndicated depends on deal size, timing requirements, borrower credit quality, and the sponsor's appetite for relationship banking versus market pricing.