UBS Bought Credit Suisse for Three Billion Francs and Bondholders Paid for It
A 167 year old bank was sold over a weekend in March, and a class of bondholders was wiped out entirely while shareholders received stock. That ordering was the controversy.
The Weekend
On March 19, 2023, UBS agreed to acquire Credit Suisse for roughly three billion Swiss francs in an all stock transaction arranged by the Swiss government and the financial regulator. Credit Suisse had existed for 167 years and was one of thirty banks designated globally systemically important.
The deal was assembled over a weekend, deliberately, because bank failures must be resolved before markets open on Monday. Deposits leave at the speed of a mobile application, and a bank that opens without a resolution may not survive the day.
The Part That Broke Convention
Alongside the acquisition, the regulator ordered roughly sixteen billion francs of Additional Tier 1 bonds written down to zero. Shareholders, meanwhile, received UBS stock worth something rather than nothing.
That ordering inverted the capital structure. Bondholders rank above shareholders. In any normal insolvency, equity is extinguished before creditors take a loss. Here the creditors were wiped out while the equity retained value, and the bond market reacted immediately.
Creditors ranking above equity received zero while equity received stock. Anyone who had priced these bonds on the assumption that seniority holds had priced them wrong.
What an AT1 Bond Actually Is
Additional Tier 1 instruments, often called contingent convertibles or CoCos, were created after the 2008 crisis to solve a specific problem. Regulators wanted banks to hold capital that would absorb losses without requiring a taxpayer rescue.
These bonds pay a high coupon and contain a contractual trigger. If the bank's capital ratio falls below a defined threshold, or if the regulator determines the bank is no longer viable, the bonds either convert to equity or are written down. Investors accepted that risk in exchange for yield, which is a reasonable trade when the trigger conditions are clearly defined.
The Credit Suisse documentation permitted a write down on a viability determination, which is what the regulator invoked. So the action had a contractual basis. The dispute was whether the trigger had legally occurred and whether wiping out creditors while paying equity was permissible.
The Legal Aftermath
Bondholders litigated, and the matter did not resolve quickly. In October 2025 the Swiss Federal Administrative Tribunal annulled the regulator's write down decree, finding that the specific trigger event required had not legally occurred when the order was issued. Further proceedings and international claims followed.
That outcome matters beyond the parties involved. It establishes that emergency resolution authority is not unlimited and that regulators writing down instruments in a crisis can be reviewed after the fact, which changes how these instruments should be priced everywhere.
Why Credit Suisse Failed
The bank was not brought down by a single event. It had accumulated years of losses and scandals, including large hits from the collapse of a family office and a supply chain finance firm in 2021, alongside repeated leadership changes and restructurings.
The proximate cause was deposit flight. Wealthy clients moved money out, the outflows accelerated after a major shareholder publicly declined to invest further, and a bank that loses funding fast enough fails regardless of whether its assets are sound. Credit Suisse met regulatory capital requirements when it collapsed, which is the recurring lesson of every bank failure worth studying.
The Bottom Line
Credit Suisse was solvent on paper and dead in practice, because banks fail on funding rather than capital. The AT1 write down showed that legal seniority is a claim you may have to litigate rather than a protection you can assume.