SummarySummary Companies Tech bank's troubles panic marketsFears spread over fallout from rising interest ratesBanks vulnerable as bond values dropLONDON, March 10 (Reuters) - For months, investors had shrugged off the threat of rising interest rates. In SVB's case, venture capital clients, unable to raise cash elsewhere, pulled money from the bank, forcing its hasty sale of bonds at a loss. In February, U.S. regulators said U.S. banks had unrealised losses of more than $620 billion on securities, underscoring the scale of the risks. Jason Benowitz, senior portfolio manager at CI Roosevelt, said SVB's risks were not unique with many banks sitting on such unrealised losses because rates have moved so rapidly. "The SVB situation is a reminder that many institutions are sitting on large unrealised losses," said AJ Bell investment research director Russ Mould.

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