Citigroup overtook JPMorgan Chase to become the largest derivatives dealer in the U.S.

The firm's derivative contracts as measured on a notional basis were $56.6 trillion at the end of first quarter, according to data compiled by the Office of the Comptroller of the Currency and released Monday. JPMorgan ranked second with $56.2 trillion and Goldman Sachs Group Inc. third with $52 trillion.

Citigroup has been expanding in derivatives as it rebuilds trading businesses that suffered after the financial crisis led the firm to take a government bailout. The U.S. lender has amassed the largest stockpile of interest-rate swaps, a type of derivative that can swing in value when central banks raise rates.

Citigroup has said it's pursued a risk-managed expansion off of a low base to bring the firm in line with competitors. Chief Financial Officer John Gerspach has said the New York- based bank doesn't consider notional values to be an accurate gauge of risk.

Revenue from trading bonds and interest-rate derivatives at Goldman Sachs fell $2.5 billion in the three months ending March 31, extending its losses to a third quarter.

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