General counsel Gregory Palm of Goldman Sachs Group Inc. late Monday made a rare filing with the government, revealing at least six shareholder suits against the company over its dealings in the subprime mortgage market, and one highly critical letter from an institutional shareholder.

The filing made no direct reference to a rumored Justice Department criminal investigation. But it did say the company anticipates that additional shareholder actions “and other litigation may be filed, and regulatory and other investigations and actions commenced, with respect to offerings of collateralized debt obligations.”