Financial gain is one of the primary reasons malicious insiders steal valuable data or sell access to sensitive systems. The internet connects buyers and sellers of sensitive data, making it easy for them to find each other, negotiate the terms, and conduct the transaction. This report focuses on the marketplace for insider information and how security and risk leaders can protect their firms' sensitive data. This is an update of a previously published report; Forrester reviews and updates it periodically for continued relevance and accuracy.