{
  "id": "d4c0545f-c1d5-5cef-8f8f-0a311e90c21e",
  "slug": "mezzanine-tranche",
  "term": "Mezzanine Tranche",
  "aliases": [],
  "category": "Fixed Income",
  "category_slug": "fixed-income",
  "difficulty": "intermediate",
  "definition": "In the context of structured finance, a mezzanine tranche is the intermediate layer of a collateralized debt obligation (CDO), collateralized loan obligation (CLO), mortgage-backed security (MBS), or other asset-backed security, ranking junior to the senior tranche in priority of payment and claim on collateral, but senior to the equity (first-loss) tranche, offering higher yields than senior tranches to compensate for increased default risk.",
  "key_takeaways": [
    "Mezzanine tranches in CLOs are typically rated BB or BBB, sitting between AAA-rated senior notes and the unrated equity tranche.",
    "The mezzanine tranche absorbs losses after the equity tranche is fully depleted but before any losses reach the senior tranches, providing a 'buffer' for senior investors.",
    "Yields on mezzanine tranches are significantly higher than on senior tranches — often 200–500 bps more — reflecting the greater credit risk absorbed.",
    "During the 2008 financial crisis, mezzanine tranches of CDOs backed by subprime mortgages suffered near-total losses when underlying default rates far exceeded historical norms.",
    "CLO mezzanine tranches have historically delivered strong risk-adjusted returns due to structural protections, disciplined manager selection, and the diversification of underlying loan pools."
  ],
  "detailed_explanation": "The mezzanine tranche is a fundamental concept in structured credit markets, where the technology of tranching allows a single pool of assets to serve investors with radically different risk appetites by slicing the pool's cash flows and losses into hierarchical layers. The mezzanine tranche — positioned between the high-quality, low-yielding senior tranches and the speculative, high-yielding equity tranche — attracts investors seeking enhanced yield over investment-grade credit without the extreme risk of the first-loss equity position.\n\nThe mechanics of tranche losses in a CLO illustrate the mezzanine tranche's risk profile. If a CLO holds a portfolio of 200 leveraged loans with a total face value of $500 million, and those loans are financed by $300 million AAA notes, $75 million AA/A mezzanine notes, $75 million BBB/BB mezzanine notes, and $50 million equity, the loss allocation works as follows: the first 10% of portfolio losses ($50 million) is absorbed entirely by the equity; the next 15% ($75 million) falls on the BBB/BB mezzanine; and only losses exceeding 25% of the total portfolio would begin to impair the AA/A mezzanine notes. This 'waterfall' structure allows the senior tranches to carry AAA ratings even when the underlying loans are non-investment-grade.\n\nMezzanine tranches offer a complex risk/reward proposition. Their yield advantage over senior tranches is substantial, but they are exposed to 'cliff risk' — the possibility that collateral losses, while not yet affecting senior tranches, could rapidly extinguish the mezzanine's subordination cushion and impair its principal. The relationship between portfolio loss rate and mezzanine value is highly nonlinear: modest loss rates have no impact, but once losses exceed the equity cushion, mezzanine investors begin to lose principal rapidly.\n\nThe 2008 financial crisis devastated mezzanine tranches of mortgage-backed CDOs, as the housing market experienced correlated defaults far beyond historical experience. 'Mezz' CDO tranches rated BBB suffered losses of 80–100% in many cases. However, CLO mezzanine tranches backed by broadly syndicated corporate loans performed far better, with losses concentrated in the equity and lowest-rated mezzanine tranches while BB-rated CLO mezzanine maintained much of their value — a distinction that highlighted the importance of underlying collateral quality and structural protections.",
  "example": "A CLO issues $500M in notes across several tranches: $300M AAA (60%) at 3-month SOFR + 115 bps, $75M AA (15%) at SOFR + 175 bps, $50M A (10%) at SOFR + 220 bps, $50M BBB (10%) at SOFR + 350 bps, and $25M equity. The BBB mezzanine tranche has 10% subordination (the equity below it) and would not be impaired until portfolio losses exceed 10% of the total pool. For a diversified pool of 150 loans with expected annual default rate of 2% and 60% recovery, annual expected losses are approximately 0.8% per year — well within the subordination cushion. The BBB mezzanine investor earns approximately SOFR + 350 bps (roughly 8.5% in a SOFR=5% environment) for bearing the credit risk above the first-loss 10%.",
  "formula": "Mezzanine Attachment Point = Equity Tranche Size / Total Deal Size; Detachment Point = (Equity + Mezzanine) / Total",
  "formula_latex": null,
  "interactive_type": "model",
  "calculator_id": null,
  "related_terms": [
    "asset-backed-security",
    "bond",
    "collateralized-debt-obligation",
    "collateralized-loan-obligation",
    "credit-risk",
    "current-yield",
    "default",
    "equity",
    "equity-tranche",
    "face-value",
    "financial-crisis",
    "high-yield-bond",
    "mortgage-backed-security",
    "senior-tranche",
    "tranche"
  ],
  "backlinks": [
    "callable-bond",
    "coupon-rate",
    "fallen-angel",
    "investment-grade-bond"
  ],
  "cross_references": [
    "asset-backed-security",
    "collateralized-debt-obligation",
    "collateralized-loan-obligation",
    "credit-risk",
    "default",
    "equity",
    "equity-tranche",
    "face-value",
    "financial-crisis",
    "mortgage-backed-security",
    "senior-tranche",
    "tranche",
    "yield"
  ],
  "tags": [
    "level:intermediate",
    "cat:fixed-income"
  ],
  "asset_classes": [
    "fixed-income"
  ],
  "regulators": [],
  "see_also": [],
  "sources": [],
  "wordcount": 677,
  "checksum": "f08a16a58e441f07",
  "version": "2026.05.03",
  "license": "CC-BY-4.0",
  "updated_at": "2026-09-07T02:15:24+00:00",
  "_links": {
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    "category": "https://hedgefund.wiki/api/v1/categories/fixed-income",
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}