Why Credit Suisse bondholders lost everything before shareholders

On Sunday, 19 March, the Swiss authorities detonated a legal and financial shockwave that shattered one of the most sacred doctrines of corporate finance. In orchestrating the emergency shotgun marriage of Credit Suisse to UBS, the Swiss Financial Market Supervisory Authority (FINMA) decreed that CHF 16 billion ($17.3 billion) of Credit Suisse’s Additional Tier 1 (AT1) capital would be written down to absolute zero, while common equity shareholders—traditionally the first to be wiped out in an insolvency—received roughly $3.25 billion in UBS stock. In a single stroke of regulatory fiat, the established hierarchy of the corporate capital stack was upended, unleashing chaos across the $275 billion global market for contingent convertible bank capital.

The foundational principle of modern insolvency law is absolute priority: equity takes first loss, junior debt absorbs losses next, and senior creditors remain protected until all junior capital is exhausted.

The Contractual Fine Print

FINMA’s justification rested on obscure contractual language buried in Credit Suisse’s Tier 1 prospectuses, which permitted a complete write-down in the event of an extraordinary government support decree (a "Viability Event").

Because the Swiss state provided a CHF 9 billion public loss guarantee and a massive emergency liquidity backstop, FINMA argued that the contractual trigger had been legally met. But while the decision may have been legally defensible under Swiss emergency statutes, it was commercially catastrophic for the broader asset class.

The AT1 Contagion

Fixed-income investors purchase bank subordinated debt under the unyielding premise that common equity must absorb total destruction before debt instruments suffer impairment. By subordinating bondholders to equity owners, the Swiss authorities injected an unhedged political risk premium into every AT1 bond issued by European banks.

Bank regulators across Frankfurt and London rushed to issue emergency statements affirming that within the European Union and the UK, common equity will always take losses before AT1s. FINMA’s ruthless prioritization of Swiss state convenience over international creditor hierarchy saved Credit Suisse from formal liquidation, but it permanently poisoned the global AT1 market, guaranteeing that banks will pay an exorbitant premium to raise regulatory capital for years to come.