The Wall Street Journal reports that about three dozen hedge funds and brokerages have been subpoenaed by the Securities and Exchange Commission within the past month for potential insider-trading violations.

Some of the inquiries are related to probable information leaks around health-care mergers of the past three years.

The commission has asked hedge fund managers and others about relationships and communications with Goldman Sachs bankers, who worked on the health-care deals. Some inquiries are also related to retail-industry deals.