NMI Holdings, Inc. has raised $550 million in initial capitalization to provide private mortgage insurance on loans sold to Fannie Mae and Freddie Mac. The money was raised through the sale of common stock in a private offering underwritten and placed by Arlington, VA-based investment bank FBR, which reportedly has a less than 5 percent stake in the new company. FBR declined to comment on the NMI transaction, citing restrictions on what it and NMI can disclose or say over the next couple of months. NMI is currently working on obtaining approvals from state insurance regulators across the country and approvals...