The crisis at JP Morgan escalated yesterday as it emerged its trading losses in London could rise to as much as $7bn (£4.5bn) and the US bank cancelled a share buyback.
Fears were growing that the losses could spiral from an initial $2bn, which was declared on 10 May, as JP Morgan struggles to unwind the massive bets made by the so-called "London Whale" trader Bruno Iksil.
In a further blow, chairman and chief executive Jamie Dimon has suspended plans to use the US bank's funds to buy back $15bn worth of shares. Buybacks are a popular way for firms to use up cash sitting on the balance sheet and prop up the share price.
Mr Dimon insisted that the decision to cancel the buyback was not linked to fears about a possible increase in losses. "You should not interpret this as anything about the size of the loss," he said.
But as doubts persisted that the crisis has not yet abated, speculation was mounting that Mr Dimon could be forced to give up at least one of his dual boardroom roles. He has previously been regarded as the savviest banker on Wall Street as JP Morgan survived the credit crunch without a bailout.
Rival traders reckon that the losses could be as high $7bn. "The markets know pretty much what JP Morgan has and in what sizes," said one trader.
The main index on which Mr Iksil's credit default swaps trades were based has calmed, which suggests that JP Morgan has decided to trade out of its positions gradually rather than take a massive hit.
Mr Dimon originally said the bank would deal with the positions to "maximise economic value". But there is a danger in taking the long view.
Mr Iksil was betting on the credit-worthiness of corporate America and if that starts to fall JP Morgan's losses could mount further. It also emerged that Ina Drew, the head of the chief investment office where the losses occurred and who quit four days after they were revealed, was out of the office for long periods after she contracted Lyme disease in 2010.
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