Silicon Valley Bank Shares slump

The four largest US banks losing more than $50bn in market value.

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On Friday, Bank Shares in Asia and Europe fell sharply.

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HSBC shares fell 4.8% and Barclays dropped 3.8%.

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On Thursday, SVB's shares saw their biggest one-day drop on record.

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They plunged by more than 60% and lost another 20% in after-hours trade.

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A $2.25bn share sale to boost its finances.

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SVB launched the share sale after losing around $1.8bn

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