Since March this year, the closure of Silicon Valley Bank, Signature Bank and First Republic Bank has caused turmoil in the U.S. banking sector, triggering market concerns and stock price volatility.。On the 7th local time, Moody's, one of the three major international credit rating agencies, announced that it would downgrade the credit ratings of 10 small and medium-sized U.S. banks, and put the credit ratings of six large U.S. banks on the downgrade watch list, while the outlook for 11 U.S. banks was set as negative.。Affected by this, the New York stock market on August 8, the three major stock indexes fell across the board, bank stocks suffered a heavy setback。