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Contingent Convertible Bond (CoCo): Meaning | Bondfish

 

Contingent Convertible Bond (CoCo): Meaning | Bondfish

Glossary› Contingent Convertible Bond

What Is a Contingent Convertible Bond (CoCo)?

A contingent convertible bond (CoCo) is a subordinated bank bond — known in Europe as an Additional Tier 1 (AT1) bond — that automatically converts into the bank’s shares, or is written down in value, if the bank’s capital falls below a preset trigger. That means you can lose part or all of your money even if the bank never formally defaults.

What it means

Banks issue CoCos to meet the capital rules introduced after the 2008 financial crisis under the Basel III framework. A CoCo pays a relatively high coupon in normal times, but it carries a built-in safety valve for the bank: if the bank runs into trouble, the bond absorbs losses so that the bank can keep operating and taxpayers do not have to step in.

Two features define every CoCo. The first is the trigger. This is usually mechanical — the bond converts or is written down when the bank’s Common Equity Tier 1 (CET1) ratio drops below a set level, most commonly 5.125% or 7% of risk-weighted assets. A second, discretionary trigger — the “point of non-viability” — lets the regulator force loss absorption if it judges the bank would otherwise fail. The second feature is the loss-absorption mechanism: some CoCos convert into equity, while others are simply written down, either temporarily or permanently.

Most European AT1 CoCos are also perpetual — they have no fixed maturity date — and are callable by the issuer, typically after about five years. Crucially, their coupons are discretionary and non-cumulative: a bank can skip a coupon payment without triggering a default, and skipped coupons are gone for good.

Why contingent convertible bonds matter for investors

The generous coupon on a CoCo is not a free lunch — it is payment for taking on genuine risk of loss without the protections most bondholders assume. The clearest illustration came in March 2023, when Swiss regulator FINMA wrote down roughly CHF 16 billion (about $17 billion) of Credit Suisse AT1 CoCos to zero as part of the UBS rescue, while shareholders still received about $3.25 billion. That inverted the usual pecking order, in which bondholders rank ahead of shareholders, and it reminded the market that CoCo terms can produce outcomes ordinary bonds never would.

For most retail investors in Europe and the UK, direct access is deliberately limited. The UK’s FCA restricted the mass-market distribution of CoCos to retail clients back in 2014, and ESMA has flagged them as generally unsuitable for ordinary retail buyers. Individual AT1 bonds are also usually issued in large minimum denominations (often €100,000 or more), which keeps them out of small portfolios. Where retail investors do get exposure, it is typically through a diversified UCITS AT1 CoCo fund or ETF rather than a single bond. If you are researching where a bank’s subordinated bonds trade and who offers them, you can filter and compare issues in the Bondfish bond screener.

Example: how the CET1 trigger works

The mechanical trigger is measured against the issuer’s capital ratio:

CET1 Ratio = Common Equity Tier 1 Capital ÷ Risk-Weighted Assets

Suppose a European bank issues a CoCo with a 7% CET1 trigger. In good times its CET1 ratio sits at, say, 14%, and the bond pays its coupon normally. If heavy loan losses cut the bank’s CET1 ratio to 6.8% — below the 7% threshold — the bond is automatically converted into shares or written down, absorbing losses to help rebuild the bank’s capital. The investor may be left holding volatile equity, or nothing at all, while the bank itself continues to operate.

Related terms

This definition is for general information only and is not investment advice. Contingent convertible bonds are complex, higher-risk instruments and may not be suitable for all investors; bond investing involves risk, including possible loss of principal.