After two years of nudging into the brokerage industry, Equifax Inc. made its biggest play yet — buying Compliance Data Center Inc. — in its bid to become the leading provider of risk-management information for brokerages.

The $10 million stock deal, completed Thursday, makes Equifax the owner of a database designed to help brokerages ferret out information on fraudulent activities and wrongdoings by customers, such as broken trades and defaults on margin loans.

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