Lehman Brothers Holdings Inc. said in filings it expects to collect another $3.2 billion from the workout of its derivatives book through 2015, of which $2.3 billion should come in the remainder of 2013, Dow Jones Newswires reported on Saturday. The failed investment banking powerhouse, which filed for bankruptcy in September 2008, is still negotiating with 1,000 of the 6,500 counterparties it had on the original derivatives portfolio, which had a $39 trillion notional value. Since 2008, the firm has recovered more than $15 billion from those derivatives. What remains is a fraction of the original face value, and the counterparties range from large, sophisticated financial institutions and hedge funds to municipalities and nonprofits.