Shares of Swiss investment bank Credit Suisse jumped as much as 40 per cent on Thursday after Switzerland’s central bank stepped in to support the lender, triggering a rally in bank stocks across Europe on easing investor concern that the firm’s troubles would trigger a global banking crisis.br br A day earlier, the bank was staring into an abyss of uncertainty after its stock crashed 31 per cent just as wider markets were recovering from a battering triggered by the shuttering of California-based Silicon Valley Bank.