Interactive Brokerage Group has submitted a bid to buy the Refco's regulated futures-trading arm that is higher than the one offered by private equity fund J.C. Flowers & CO. and a group of investors, The Wall Street Journa reports.

IBG's bid adds up to about $790 million, which is 6% above the unit's net regulatory capital. J.C. Flowers' bid was $768 million, just 3% above the unit's book value. 

"We anxiously await the response of Refco," said Gary Mennitt, an attorney representing IBG.

Since the Refco scandal broke, clients have withdrawn about 40% of their money. The bids will be addressed at a Monday hearing in Bankruptcy court in New York.

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