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Police officers leave Silicon Valley Banks headquarters in Santa Clara, California on March 10, 2023.

In the middle of last week, Moody's Investors Service delivered alarming news to SVB Financial, the parent of Silicon Valley Bank: the ratings firm was preparing to downgrade the bank's credit.

That phone call, described by two people familiar with the situation, began the process toward Friday's spectacular collapse of the startup-focused lender, the biggest bank failure since the 2008 financial crisis.

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