The fate of Lehman Brothers Holdings Inc.'s darkened early Sunday afternoon after Barclays PLC, the sole remaining bidder for the 158-year-old Wall Street firm, told federal regulators that it is walking away from a transaction, people familiar with the matter say.

With Barclays ending talks and the government balking at putting any taxpayer money at risk for Lehman, the likelihood of a transaction was dimming. That would leave an orderly liquidation as the most likely scenario, a dramatic outcome for a once-powerful firm.

As word that a Barclays deal was off filtered across Wall Street, credit derivative traders scrambled to unwind their outstanding contracts with Lehman and shift their positions to other banks. CDS traders at many Wall Street firms were told to come to work immediately.

With many trading desks open, investors rushed to buy credit default swaps tied to other brokerages and corporations, sending the cost of protection on investment banks such as Goldman Sachs and others sharply higher. One senior trader said Bank of America is offering to face Lehman's counterparties in CDS trades, as long as the swaps don't reference Lehman's own debt.

In a statement on Sunday, the International Swaps and Derivatives Association, a trade group whose members include many large dealers, said a "netting trading session" will take place between 2 p.m. and 4 p.m. on Sunday to allow Lehman's counterparties to offset their positions against each other.

"The purpose of this session is to reduce risk associated with a potential Lehman Brothers Holdings Inc. bankruptcy filing," it said, adding that trades conducted during this period "are contingent on a bankruptcy filing on or before 11.59 p.m. New York time" today. If no filing takes place, the trades will be canceled, ISDA said.

The apparently insurmountable obstacle to a deal was reluctance by U.S. regulators to financially back an acquisition or the creation of a so-called "bad bank" to wind down Lehman's assets.

Bank of America Corp., the other leading bidder on Friday, had indicated by Sunday morning that it wasn't interested in a transaction without government support.

One person familiar with the matter said large dealers contemplated showing each other all of their credit default swap trades with Lehman. Disclosing their positions may enable dealers to find ways to offset their positions with each other wherever possible. Later in the day, some traders were told that Lehman — with the help of Federal Reserve officials — will try to figure out which of its counterparties have CDS trades that can be offset. Those counterparties would be informed of the offsetting positions, following which they can unwind their respective swaps with Lehman and concurrently enter into new swap contracts with each other. For example, if one dealer has bought a swap from Lehman and Lehman bought a similar swap from another bank, the two banks could agree to face each other directly.

Such moves could help prevent individual firms from scrambling to find new counterparties to rehedge their positions with when the markets reopen on Monday, potentially unleashing turmoil across the credit markets. They could also help facilitate an orderly wind-down of Lehman's derivative positions, if that becomes necessary. Still, sorting out the firm's CDS positions promises to be a difficult and time-consuming task, because many of the contracts have different terms and maturity dates.

It is not known how much in CDS contracts Lehman has. In a survey last year by Fitch Ratings, Lehman was listed among the 10 largest CDS counterparties by number of trades and the amount of debt to which the contracts were tied.

Wall Street traders poured into their offices Saturday for emergency meetings to consider the actions they would take if Lehman is forced into liquidation. They broke into teams to evaluate their positions and exposure to Lehman in everything from energy trades to equity derivatives to credit,

One trader said conditions in the credit default swap market and the short-term repo markets are more stable today than they were in March, when Bear Stearns nearly collapsed, but still, "if they go into liquidation," it is going to be a bad situation on Monday.

A disorderly unwind of Lehman's derivatives trades is only one worry. Another worry is that if Lehman collapses, its distressed assets — such as commercial real estate — could suddenly hit Wall Street for sale, forcing prices even lower and potentially forcing other dealers to mark down once again the value of their own holdings.

Lehman has hired law firm Weil, Gotshal & Manges LLP to prepare a potential bankruptcy filing, according to a person familiar with the situation. The New York-based Weil has a leading bankruptcy practice and advised Drexel Burnham Lambert on its 1990 bankruptcy filing.

In a Lehman bankruptcy, the firm's brokerage units would have to enter a Chapter 7 liquidation, in which a court-appointed trustee would take over, liquidate the firm's assets and get Lehman customers back their money. In general, securities that a customer holds at a brokerage firm are legally the investor's property and aren't exposed to the claims of the firm's creditors.

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