Wall Street is concerned about the health of the nation’s regional banks, after a few of them wrote off bad loans to commercial customers in the last two weeks.

Zions Bank, Western Alliance Bank, and Jefferies disclosed bad investments, causing their stocks to fall sharply this week.

“When you see one cockroach, there are probably more,” JPMorgan Chase CEO Jamie Dimon told investors and reporters on Tuesday, when JPMorgan reported its results.

The KBW Bank Index, which tracks banks, is down 7% this month.

There were other signs of distress. Data from the Federal Reserve shows that banks tapped the central bank’s overnight “repo” facilities for the second night in a row, an action banks have not needed to take since the Covid-19 pandemic. This facility allows banks to convert highly liq

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