Federal regulators have given final approval to a long-delayed measure increasing oversight of Wall Street banks. The Volcker Rule aims to curb proprietary trading, in which banks trade financial securities from their own commercial accounts. The rule was included in the 2010 Dodd-Frank financial reform bill, but needed final approval from all five federal banking agencies, including the SEC and the Federal Reserve. In a major win for banks, the final version grants some exemptions and effectively hands them responsibility for judging their own compliance. In a statement, the group Public Citizen called the Volcker Rule’s approval “a step forward toward a safer financial system” but warned: “There still could be too many opportunities for banks to disguise as permitted activity what should be deemed prohibited proprietary trading.”