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“What transpired at Semgroup was no less than a $500 billion fraud on the people of the world,” says John Catsimatidis, the billionaire grocer turned oil refiner who is attempting to reorganize Semgroup in bankruptcy court. The $500 billion is how much the world would have overpaid for crude had a successful scam pushed up oil prices by $50 a barrel for 100 days.....What’s the evidence of this? Much is circumstantial. Proving oil-trading manipulation is difficult. But numerous people familiar with the events insist that Citibank, Merrill Lynch and especially Goldman Sachs had knowledge about Semgroup’s trading positions from their vetting of an ill-fated $1.5 billion private placement deal last spring. “Nothing’s been proven, but if somebody has your book and knows every trade, it would not be difficult to bet against that book and put the company into a tremendous liquidity squeeze,” says John Tucker, who is representing Kivisto.<snip>

Shortly before it filed for bankruptcy, Semgroup sold its trading book toBarclays Capital. Barclays’ bold bet was that the price of crude would fall, erasing the losses. It is believed that 30 days later Barclays was sitting on a $1 billion gain as oil indeed fell, to $114 a barrel. Barclays wouldn’t comment other than to confirm it still owns the book. That prices plunged after Semgroup failed is more evidence of manipulation, says Catsimatidis: “With the portfolio in Barclays’ hands they could not squeeze the shorts anymore. The jig was up, and oil collapsed.”