📚 Stock Market Glossary
Clear, beginner-friendly explanations, real-world analogies, and visual formulas for key stock market terminology.
CoCo Bond Capital Write-Down & Equity Conversion
Macro & Policy💡 Key Takeaway: A structural loss-absorption risk in Contingent Convertible (AT1) bonds where principal is completely wiped out or converted into equity upon a regulatory capital breach.
Self-Destructing Bond Analogy: A high-interest 8% promissory note with a legal clause stating that if the borrower gets in financial trouble, your loan note instantly disintegrates into thin air.
😎 10-Second Show-off Pro Tip for Friends!
😎 Show-off Tip: 'Bonds aren't always safer than equity. In the Credit Suisse collapse, equity got paid while $17B of AT1 CoCo bonds were permanently written down to zero!'
📖 Beginner-Friendly Explanation
STEP 1
Core Concept & Meaning
Contingent Convertible (CoCo / AT1) bonds are hybrid capital instruments that automatically write down to zero or convert into equity if a bank's capital ratio falls below a contractual trigger.
STEP 2
Why It Matters & Mechanism
In standard corporate waterfalls, bondholders rank senior to equity. However, AT1 contractual terms allow regulators to trigger full permanent write-downs ahead of shareholders during a banking viability crisis.
STEP 3
Practical Investment Tips & Pitfalls
The $17B AT1 write-down during the Credit Suisse-UBS merger demonstrated that high yields on CoCo bonds carry total principal forfeiture risk during systemic stress.
📊 AT1 Capital Write-Down Trigger Formula
CET1 Ratio ≤ 5.125% (or 7.0%) OR Point of Non-Viability (PONV Regulatory Order)
• Breaching the CET1 trigger activates automatic loss absorption
• Regulators declaring PONV forces 100% permanent principal write-down regardless of accounting ratios
⚖️ Key Comparison at a Glance
| Feature | Senior Bank Debt | Subordinated Debt (Tier 2) | Additional Tier 1 (AT1 CoCo) |
|---|---|---|---|
| Seniority | Senior ranking | Subordinated ranking | Deeply subordinated (Just above equity) |
| Write-Down Risk | Only in formal liquidation | Only after senior claims | 100% permanent write-down upon PONV trigger |
| Coupon Discretion | Mandatory (Default if missed) | Mandatory | Fully discretionary (Bank can cancel coupons) |
| Regulatory Capital | 0% (Pure liability) | Tier 2 Capital | Additional Tier 1 (Core capital treatment) |
📌 Practical Market & Real-World Example
In March 2023, Swiss regulator FINMA wiped out $17 billion of Credit Suisse AT1 bonds during its emergency takeover by UBS.