JP Morgan Chase & Co. is rocking the financial markets with the disclosure that its in-house trading operating lost $2 billion in the past six weeks, raising new questions about whether the big banks that caused the financial meltdown have sufficiently changed their ways.

Chief Executive Officer Jamie Dimon said the trading loss was an "egregious" failure in a unit managing risks, but he added in a call with analysts after the markets closed Thursday that just because the bank did something "stupid" that doesn't mean other firms are having such trouble.

"There were many errors, sloppiness and bad judgment," Dimon said. "These were grievous mistakes, they were self-inflicted."

Congress and the FDIC have been grappling with how to prevent "too big to fail" institutions from taking big risks knowing that the U.S. Treasury is there to back them up.

The Securities and Exchange Commission has started an early stage review into the loss, according to the Wall Street Journal.

"I think it's safe to say that all the regulators are focused on this," SEC Chairwoman Mary Schapiro told reporters after a speech at a Washington conference, according to news reports. She declined further comment.

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