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The U.S. said that at its most profitable point in 2009, the SCP produced more than US$1 billion in revenue for JPMorgan.

Bruno Iksil, the Frenchman at the center of the case who became known as the London Whale because his portfolio was so large, wasn’t named in Monday’s filing. He signed a non-prosecution agreement with the U.S. in June, Bharara said last month. Iksil has pledged to cooperate with prosecutors as part of the deal with the U.S.

Martin-Artajo “engaged and directed” the scheme in order to enhance his apparent job performance and position at JPMorgan and eligibility for promotion and bonuses, and to “forestall a possible plan by the bank to move the synthetic credit portfolio to JPMorgan’s investment bank,” prosecutors said.

Grout was accused of participating with Martin-Artajo in the conspiracy to “curry favor with his supervisor and to enhance his apparent job performance,” according to the indictment.

Unnamed Traders

While the government says other unnamed co-conspirators acted with Martin-Artajo and Grout, the indictment describes “Trader #2” and “Trader #3” as JPMorgan employees who worked in London for Martin-Artajo at the Chief Investment Office. “Trader #2” had the responsibility for marking the positions of the SCP when Grout was unavailable or out of the office, prosecutors alleged.

Beginning in January 2012, the SCP began to lose money so Grout marked the positions and reported about US$100 million in mark-to-market losses, the U.S. said in the indictment.