One normally staid corner of the financial markets—preferred stock—has been rattled by the Silicon Valley Bank and Signature Bank seizures, and that has created opportunities for investors.
Preferreds are a senior form of equity whose dividends come before those of common stock. Preferred shares issued by banks, however, account for about two-thirds of the $400 billion market and the twin bank failures have highlighted the credit risk in these securities.
Source: https://www.barrons.com/articles/banks-preferred-stock-e95f6b45?siteid=yhoof2&yptr=yahoo