Credit Suisse stock slump triggers close monitoring by regulators
Credit Suisse shares slumped by as much as 30% on Wednesday after its largest shareholder said it could not provide further support, prompting the Swiss bank's CEO to make new assurances on its financial strength.
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### Instruction: Credit Suisse stock slump triggers close monitoring by regulators

### Response: Credit Suisse shares slumped by as much as 30% on Wednesday after its largest shareholder said it could not provide further support, prompting the Swiss bank's CEO to make new assurances on its financial strength.