Stock markets across the UK, France and Germany rebounded while Credit Suisse's share price surged by 40%.
Overnight Credit Suisse said it would borrow up to 50bn francs (£44.5bn) from Switzerland's central bank to shore up its finances.
Fears that Credit Suisse's issues could cause a wider banking crisis had sent stock markets tumbling on Wednesday.
The main stock market indexes in London, Frankfurt and Paris opened as much as 1.7% higher.
Credit Suisse had sought help from Swiss National Bank after revealing it had found "material weakness" in its financial reporting.
It led its biggest shareholder, Saudi National Bank, declaring that it would not buy more shares in the bank, sparking panic among other investors.