Federal regulators announced on Wednesday an overhaul of a murky Wall Street market that gained infamy during the financial crisis of 2008.

The Federal Reserve and the Office of the Comptroller of the Currency, as well as three other agencies, proposed a rule that would apply to over-the-counter derivatives, the financial instruments that banks and other financial entities use to speculate or hedge their risks.

American banks have nearly $280 trillion of derivatives on their books, and they earn some of their biggest profits from trading in them. But the 2008 crisis revealed how flaws in the market had allowed for dangerous buildups of risk at large Wall Street firms and worsened the run on the banking system.

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