Banking crisis fears impact stock market, but some short sellers profit.

Short sellers of regional banks have made $3.53 billion in mark-to-market profits in March month to date, with $2.29 billion in profits in the last three trading days alone, according to S3 Partners. Silicon Valley Bank and Signature Bank were among the top 20 most-shorted regional bank stocks. The SPDR S&P Regional Banking Sector ETF plunged 23% from March 8 to March 13, leading to $416 million of new short selling in the regional banks. However, with some calm returning to markets, the short trade on regionals could be poised to go the other way.