Only about one-third of the 387 sets of rules required by the Dodd-Frank Act have not yet been proposed, as the first deadlines for the regulations in July draw near, according to the law firm Davis Polk & Wardwell. The U.S. Securities and Exchange Commission and the Commodity Futures Trading Commission, charged with writing the regulations, lately have said it was more important to get the rules right than to meet unrealistic deadlines set by Congress.