Silicon Valley Bank collapsed because it held too many long-term bonds and not enough cash when customers started withdrawing money all at once

Silicon Valley Bank (SVB) failed on March 10, 2023, after a classic bank run. The bank had invested heavily in U.S. Treasury bonds and mortgage-backed securities when interest rates were low. When the Federal Reserve raised interest rates sharply in 2022, those bonds lost value on paper—but SVB didn't have to sell them unless customers demanded their money back. In mid-March 2023, large depositors began withdrawing funds rapidly. SVB tried to raise cash by selling bonds at a loss, which spooked more customers into withdrawing. Within days, the bank ran out of liquid cash and closed.

The failure happened fast because SVB's customers were mostly tech companies and venture capital firms—not typical retail depositors. These are large account holders who move money in and out quickly. When news broke that SVB was in trouble, they all tried to withdraw at once. A traditional bank with millions of small depositors might have survived longer because not everyone withdraws on the same day.

Key Takeaways

  • SVB failed because it held long-term bonds that lost value when interest rates rose, and it didn't keep enough cash on hand to cover sudden large withdrawals.
  • The bank's customer base was concentrated in tech and venture capital—large, sophisticated account holders who withdrew money simultaneously when trouble appeared.
  • The Federal Deposit Insurance Corporation (FDIC) took over SVB and protected all deposits up to $250,000 per account; deposits above that amount were initially at risk but were later protected by emergency action.
  • SVB's failure did not affect how deposit insurance works for other banks, and your money in FDIC-insured accounts at other institutions remains protected up to $250,000.
  • Banks are required to hold a certain amount of liquid assets and undergo stress tests, but SVB's risk management failed to prevent this specific scenario.

How SVB's bond portfolio created the problem

When interest rates were near zero in 2020 and 2021, SVB bought large amounts of long-term U.S. Treasury bonds and mortgage-backed securities. These are safe investments, but they lock in a fixed interest rate. If you buy a 10-year Treasury bond paying 1.5%, and interest rates later rise to 4%, that bond is now worth less because new bonds pay more. SVB owned roughly $91 billion in securities, many of them long-term bonds.

As long as SVB held these bonds until maturity, the losses were only "on paper"—the bank would eventually get its full money back. The problem arose when the bank needed cash immediately. In March 2023, SVB announced it had to sell $21 billion in securities to cover withdrawals. When it sold those bonds early, it locked in the losses. That announcement triggered panic among depositors.

Most banks face this same risk to some degree, but they manage it by keeping enough cash and short-term liquid assets on hand. SVB did not. The bank had grown rapidly serving tech companies and venture firms, and it assumed deposits would stay stable. That assumption was wrong.

Why the bank run happened so quickly

A bank run occurs when many depositors try to withdraw their money at the same time, faster than the bank can pay them. SVB's customer base made this scenario likely. The bank held deposits from thousands of tech startups, venture capital firms, and their employees. These are not typical retail customers who keep money in savings accounts for years. They are businesses that move large sums regularly.

On March 8, 2023, venture capital firm Sequoia Capital sent a memo to its portfolio companies advising them to move their cash out of SVB immediately. That single memo triggered a cascade of withdrawals. Within 48 hours, customers tried to withdraw $42 billion—far more than the bank had in liquid cash. By March 10, the FDIC closed SVB and took control of its assets.

A retail bank with millions of small depositors might have survived this same bond portfolio problem, because not all retail customers withdraw on the same day. SVB's concentrated customer base meant that when panic started, nearly everyone left at once.

What the FDIC did and how deposit insurance worked

The Federal Deposit Insurance Corporation (FDIC) is the federal agency that insures bank deposits. When SVB failed, the FDIC took over the bank and protected all deposits up to $250,000 per depositor, per account type, at that bank. This is the standard limit for FDIC insurance.

SVB had many depositors with balances above $250,000. Initially, those account holders faced losing the money above the insurance limit. However, on March 12, 2023, the U.S. Treasury Department, Federal Reserve, and FDIC announced an emergency action: they would protect all SVB deposits in full, regardless of amount. This was an extraordinary step taken to prevent panic from spreading to other banks.

The emergency protection for SVB deposits was temporary and specific to that bank. It did not change how FDIC insurance works at other banks. Your deposits at other FDIC-insured banks remain protected up to $250,000 per account. If you have more than $250,000 at one bank, you can protect additional funds by opening accounts in different ownership categories (such as a joint account or a retirement account), each of which has its own $250,000 limit.

Regulatory oversight and what banks are required to do

Banks are required by law to hold a minimum amount of capital and liquid assets. The Federal Reserve also conducts annual stress tests on large banks to see whether they could survive a financial crisis. SVB was a regional bank with roughly $209 billion in assets, which made it subject to these rules, though with less stringent requirements than the largest national banks.

SVB's regulators knew the bank held a large bond portfolio and faced interest rate risk. However, the bank's risk management systems did not flag the specific scenario that occurred: a rapid, concentrated withdrawal of deposits. The bank's own stress tests apparently did not model a situation where most of its customers tried to leave at the same time.

After SVB's failure, regulators and Congress reviewed whether the rules were adequate. Some argued that regional banks should face stricter requirements; others said the problem was that SVB's management ignored known risks. The debate continues, but the rules themselves did not change immediately after the failure.

How SVB's failure affected other banks

SVB's collapse raised concerns that other regional banks might face similar problems. Several other banks with large bond portfolios and concentrated depositor bases came under scrutiny in the weeks after SVB failed. First Republic Bank, which also served wealthy and business customers, failed in May 2023. Signature Bank also closed in March 2023 after customers withdrew deposits rapidly.

However, most banks did not fail. The emergency actions by the Treasury, Federal Reserve, and FDIC—particularly the may provide that all SVB deposits would be protected—calmed markets and prevented a broader banking crisis. Deposit insurance remained unchanged at other banks: $250,000 per account, per depositor.

For most people with typical bank accounts, SVB's failure had no direct impact. If your deposits at other banks are under $250,000 per account, they were protected before SVB failed and remain protected now. If you have more than $250,000 at one bank, you should consider splitting deposits across multiple accounts or banks to stay within insurance limits.

What happened to SVB's assets and customers

After the FDIC took control of SVB, it worked to sell the bank's assets and return deposits to customers. In March 2023, the FDIC arranged for First Citizens BancShares to purchase most of SVB's assets and assume its deposits. This meant that most SVB customers could access their money through First Citizens without waiting for a lengthy liquidation process.

SVB's employees, customers, and the venture capital community that relied on the bank faced disruption. Some startups had to move their operations or find new banking relationships quickly. However, because deposits were protected (either through the standard $250,000 limit or the emergency may provide), customers did not lose money. The failure was a business disruption, not a financial loss for depositors.

Frequently Asked Questions

Could SVB's failure happen at my bank?

Any bank can fail if it mismanages its assets or faces a sudden, severe withdrawal crisis. However, most banks hold more liquid cash than SVB did and have more diverse customer bases. The FDIC insures deposits up to $250,000, so even if your bank fails, your money is protected up to that limit. If you have more than $250,000 at one bank, split it across multiple accounts or banks to stay within insurance limits.

Did the government bail out SVB?

The government did not inject money into SVB or keep it open. The FDIC took over the bank and sold its assets to First Citizens. The emergency action was to protect all deposits in full, not to save the bank itself. This protected depositors but did not prevent the bank from closing.

Why didn't regulators stop SVB before it failed?

Regulators knew SVB held a large bond portfolio and faced interest rate risk. However, the bank's risk management systems did not predict or plan for a scenario where most customers withdrew deposits simultaneously. The failure was a combination of poor management decisions and an extreme but plausible market event.

Is my money safer now after SVB failed?

Deposit insurance rules did not change after SVB failed. Your money at FDIC-insured banks remains protected up to $250,000 per account. The emergency may provide for SVB deposits was temporary and specific to that bank. To keep your money fully protected, stay within the $250,000 limit per account at each bank.

What should I do if I have more than $250,000 at one bank?

You can protect additional funds by opening accounts in different ownership categories at the same bank (such as a joint account, a retirement account, or an account in trust), each with its own $250,000 limit. Alternatively, split your deposits across multiple FDIC-insured banks. Check the FDIC's website for details on how different account types are insured.