By Craig Torres

Sept. 14 (Bloomberg) -- A group of banks and brokers began preparing for a potential Lehman Brothers Holdings Inc. bankruptcy filing today, addressing outstanding trades that the company has in over-the-counter derivatives markets.

Financial firms have started ``netting'' Lehman trades on credit, equity, interest-rate, foreign exchange, and commodity derivatives, according to a statement from the International Swaps and Derivatives Association e-mailed to Bloomberg News.

``ISDA confirms a netting trading session will take place between 2 p.m. and 4 p.m. New York time for over-the-counter derivatives,'' the ISDA said. ``Trades are contingent on a bankruptcy filing at or before 11:59 p.m. New York time, Sunday, Sept. 14, 2008. If there is no filing, the trades cease to exist.''

The announcement came after Barclays Plc, the U.K.'s third- biggest bank, said it abandoned talks to buy Lehman, contending it couldn't obtain guarantees to protect against potential losses at the U.S. securities firm.

To contact the reporter on this story: Craig Torres in Washington at ctorres3@bloomberg.net

Last Updated: September 14, 2008 14:40 EDT

By Craig Torres