Lehman Brothers Holdings Inc. said Wednesday that it has agreed to sell another $2.5 billion in bankruptcy claims that the failed investment bank holds against its U.S. brokerage arm, the Wall Street Journal reported today. Lehman has been selling off the unsecured creditor claims in recent months as it continues to wind down its holdings, a process that is expected to continue for several more years. In September, Lehman agreed to sell $2.5 billion in claims for about 25 percent of their face value. Lehman, once the nation’s fourth-largest investment bank by assets under management, collapsed into the largest bankruptcy ever in September 2008, with $613 billion in liabilities. Most of Lehman’s brokerage business was sold to Barclays PLC, and the holding company officially exited bankruptcy in 2012. What remains of Lehman’s brokerage unit is being wound down separately from the holding company.