Citadel Investment Group, the Chicago-based hedge fund, is seeking to recover $470.5m it believes it is owed by the failed investment bank Lehman Brothers, according to court documents.

In a short form filed by Citadel last week on behalf of its Citadel Equity Fund, the company said the figure covered the value of failed derivatives contracts, net of collateral, which had been entered into with Lehman Brothers as counterparty. The claim also covers the costs associated with replacing the contracts.