LEHMAN Brothers Holdings Inc has filed a lawsuit against Barclays Capital Inc alleging the British bank took control of excess assets in collusion with Lehman executives when it bought its US brokerage business a year ago, court documents show.

Lehman filed for bankruptcy on Sept. 15, 2008, in the largest US bankruptcy in history. Its flagship US brokerage business was sold to Barclays less than a week later in a hurriedly assembled deal.

Lehman said in September this year that Barclays Capital got an US$8.2 billion "windfall profit" due to the fire sale of its business for an undisclosed US$5 billion discount off the book value of securities transferred to Barclays.

"The windfall to Barclays was not disclosed to the Court, the Lehman Boards or Lehman's lawyers so as to allow the transfer to Barclays of billions of dollars in excess assets, without consideration, in a manner designed to avoid judicial, corporate and creditor oversight," Lehman said in a Monday court filing.

The charges come after Lehman received approval in June to probe whether Barclays got "too good of a deal" when it bought Lehman's brokerage business, as the British bank was able to quickly book a US$4.2 billion gain on its US$1.75 billion purchase.

Barclays said at the time that it did not expect the probe to result in any additional claims.

In the lawsuit, Lehman requested the court to order Barclays to "disgorge to Lehman any ill-gotten gains it
obtained" and pay punitive damages.

A Barclays Asia spokesman said in an email that all queries on the lawsuit should be directed to its New York office.

Barclays' New York officials were not immediately available for comment, outside of normal US hours.