Why Silicon Valley Bank's crisis is rattling America's biggest banks

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The problems of two small banks on the West Coast are rippling across markets and causing new investor concerns about some of the country’s largest financial institutions.

Why? Three words: rising interest rates.

The Federal Reserve’s aggressive campaign to bring down inflation helped set the stage for major problems at two California lending institutions — SVB Financial (SIVB) and Silvergate Capital (SI) — as an outflow of deposits forced both to sell assets at a loss. Those assets were bonds.

Banks are big investors in assets like Treasury bills because they need lots of safe places to park their cash. Many financial institutions piled into these investments during a period of historically-low interest rates that spanned the early years of the pandemic, as banks took in tons of new deposits and lending was somewhat restrained.

But now the Fed is hiking rates at a rapid clip, with Fed Chair Jay Powell warning earlier this week the central bank may have to speed up the pace of its rate increases to cool the economy further. The problem that creates for banks is simple: higher rates lower the value of their existing bonds.

The withdrawals at SVB's Silicon Valley Bank have come from startups and technology firms, many of which also ran into new trouble once the Fed began raising rates.

The deposit outflow forced SVB to sell assets and take a $1.8 billion loss, a move the bank made “because we expect continued higher interest rates, pressured public and private markets, and elevated cash-burn levels from our clients as they invest in their businesses.” Its shares fell more than 60% Thursday.

In pre-market trading on Friday, SVB shares were down another 60% after overnight reporting from Bloomberg said VC firms ranging from Peter Thiel's Founders Fund to Union Square Ventures had told portfolio companies to pull their money from Silicon Valley Bank.

Silicon Valley Bank headquarters and branch in Santa Clara on Aug 7, 2019.
Silicon Valley Bank headquarters and branch in Santa Clara on Aug 7, 2019. · Sundry Photography via Getty Images

Forced sales, forced losses

Banks don't have to realize losses on bonds that may have gone down in value amid rising rates if they're not pushed to sell these assets. But Silvergate Capital and SVB Financial didn’t have that choice. Customer withdrawals at Silvergate Bank and SVB’s Silicon Valley Bank forced their hand.

At Silvergate, which caters to cryptocurrency clients, customers yanked their money in the panic that followed the 2022 collapse of cryptocurrency exchange FTX. Silvergate said in January that it had realized losses of $886 million from selling securities as deposits fell. That weakened the bank considerably. On Wednesday it said it would wind down its bank, and its shares plunged Thursday.