Distressed investors bought and sold $2.34 billion worth of bankruptcy claims last month, nearly all of which is tied to Lehman Brothers Holdings Inc. and MF Global Inc.

Approximately $2.2 billion worth of Lehman and MF Global claims traded hands in June, according to data released Tuesday by claims trading market operator SecondMarket Inc., meaning that the wind-downs of those two financial firms accounted for 94% of the debt that traded last month.

Specifically, $1.9 billion of Lehman debt was bought and sold in 422 trades, while $296.8 million of MF Global debt swapped hands in 270 trades.

The relative lack of activity in other cases can be attributed to the size of the Lehman and MF Global cases as well as too few large Chapter 11 filings to satisfy distressed investors' demand.

"At the end of the day, the market right now for claims trading is not particularly robust," Andrew Gottesman, the head of SecondMarket's bankruptcy claims market, said in an interview Monday. "It's harder to find product."

As a result, distressed investors are circling the bankruptcy cases of companies like American Airlines parent AMR Corp. (AAMRQ) and defunct telecommunications firm Nortel Networks Corp. (NRTLQ), where investors believe creditors have a chance of recovering a substantial portion of what they're owed.

AMR, which is talking to potential merger partners and getting closer to securing labor deals with its unions, saw $15.1 million of its debt swap hands in 49 trades last month. And creditors of Nortel shed claims worth $8.7 million in 52 trades as they tire of waiting for the company to distribute the fruits of its long-running liquidation, which currently top $9 billion.

That money is being held back from creditors as Nortel sorts through what it owes and to whom, a complex process that can be slowed by the sheer number of claims and disputes over those claims.

"Delays like that drive trading," Mr. Gottesman said, as creditors prefer to wash their hands of a claim in exchange for cash now rather than hold out hope for a future payout.

In all, SecondMarket recorded 1,013 bankruptcy-claim trades in June, up by nearly 11% over the 925 trades in May but short of the 1,787 trades in June 2011.

Thanks largely to Lehman and MF Global, the total debt traded last month marked a 21% increase over the $1.9 billion traded in May. The dollar value of last month's traded debt also fell short when compared to the prior June, during which $2.8 billion worth of debt changed hands.

MF Global has been liquidating since last fall, not under bankruptcy-court protection but under federal securities laws because it is a broker-dealer. Lehman emerged in March from its Chapter 11 proceeding, but its wind-down continues.

(Dow Jones Daily Bankruptcy Review covers news about distressed companies and those under bankruptcy protection. Go to http://dbr.dowjones.com)

Write to Jacqueline Palank at jacqueline.palank@dowjones.com.

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