Goldman Sachs Group Inc. is launching a specialty finance company to invest in high-risk debt, primarily of midsize U.S. companies with no credit ratings, the Wall Street Journal reported today. The New York firm said in a filing with the Securities and Exchange Commission on Friday that it plans to offer shares in the new unit, Goldman Sachs Liberty Harbor Capital LLC. The new Goldman company comes as the New York securities firm seeks ways to boost revenue and provide returns to shareholders under tighter constraints on its own investing and requirements to hold more capital.