People walk near the logo of the Swiss bank Credit Suisse in Zurich, Switzerland March 20, 2023.
Mandatory Credit:	Denis Balibouse/Reuters

People walk near the logo of the Swiss bank Credit Suisse in Zurich, Switzerland March 20, 2023.
Mandatory Credit: Denis Balibouse/Reuters

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What are AT1 bonds and why are Credit Suisse's now worthless?

Investors in a riskier type of Credit Suisse's bonds had the value of their holdings slashed to zero Sunday after Swiss authorities brokered an emergency takeover of the bank by rival UBS.