That could certainly happen. It won't take much. However, where would they put their money? These deposits are usually money that needs to be "available" (payroll for example) otherwise it would already be held in other investments of some sort. I think another bank or 2 could experience a run here soon, but I don't think there can be a widespread enough run, due to no other options, to cause systemic risk.
A corporate treasurer with deposits in excess of FDIC insurance could do a few things:
1) Move the company to a better-capitalized bank or a network of separate bank accounts, which would force the original bank to sell their bonds and recognize a loss.
2) Move funds in excess of FDIC limits to treasuries (i.e. just click buy on TreasuryDirect). For the bank, it's a withdraw like #1.
3) Pay for supplemental deposit insurance. This would be hard to justify when treasuries are yielding 5%.
4) Hedge against a bank run by shorting the bank's stock, the VIX, etc. This would be hard to justify for the same reasons as insurance would be hard to justify. And if you're going to set up a second account, why not just use multiple bank accounts to stay under FDIC limits?
A run is possible because if enough corporate treasurers made withdraws as in #1 and #2, the banks would have to sell treasuries and recognize losses to fund those withdraws. Then they would end up undercapitalized and subject to FDIC intervention.
Fun fact! I was recently laid off from a Silicon Valley startup, and I was due to receive a severance payment sometime in the next few days. I received an email today that the startup banks with SVB and so there may be some delay there. This should be interesting...
That means payroll was missed too! According to the FDIC, depositors will have access to funds by Monday morning, and the bank's assets (mark to market?) exceeded liabilities.
The bank had $209 billion in assets and $175.4 billion in deposits. The FDIC, which serves as a backstop for deposits at U.S. banks up to a limit of $250,000, said all insured depositors would have access to their funds "no later" than Monday morning.
https://finance.yahoo.com/news/silicon-valley-bank-fdic-closed-largest-failure-financial-crisis-182643368.htmlAlso, this bank catering to people with deposits larger than FDIC insurance would cover was a natural first domino to fall. Check out this statistic:
Roughly 87% of Silicon Valley Bank's deposits were uninsured as of December 2022, according to its annual report. Uninsured depositors will receive an advance dividend within the next week and a receivership certificate for the remaining out of their uninsured funds, the FDIC said. It could make future dividend payments as it sells Silicon Valley Bank's assets.
No wonder there was a risk of a bank run. 87%???
In light of this failure of risk management, I think a lot of corporate board members are emailing their CFO's today to ask about uninsured deposits.