Stress test shows bank credit losses could be $600 billion Ten of 19 institutions must raise $74.6 billion in private capital by November By Ronald D. Orol, MarketWatch Last update: 7:49 p.m. EDT May 7, 2009 Comments: 942 WASHINGTON (MarketWatch) -- Federal regulators released the long-anticipated, controversial stress tests on the health of the 19 largest financial institutions on Thursday, showing that the banking sector is secure, but under a pessimistic forecast, banks' credit losses over the next two years could be $600 billion.