In the case of oil and gas trading, regulators made it clear that they were willing to move, without waiting for Congress to act on Mr. Obama’s overhaul, invoking their existing powers.

The Commodity Futures Trading Commission said it would consider imposing volume limits on trading of energy futures by purely financial investors and that it already has adopted tougher information requirements aimed at identifying the role of hedge funds and traders who swap contracts outside of regulated exchanges like the New York Mercantile Exchange.

“My firm belief is that we must aggressively use all existing authorities to ensure market integrity,” said Gary Gensler, chairman of the commission, in a statement. He said regulators would also examine whether to impose federal “speculative limits” on futures contracts for energy products.

Much of Mr. Gensler’s announcement was focused on precise issues well within his agency’s authority, suggesting that he was serious about seeking changes. But his proposals could encounter fierce opposition from big banks and Wall Street firms, which are each big traders in the commodity markets and manage big investment funds focused on commodities. Oil prices hit a record high of $145 a barrel last summer, then plunged to $33 a barrel last December and have since bounced back to more than $60.

Much of the wild swings over the last year were caused by chaos in the global financial system, as banks and much of Wall Street came perilously close to collapse last September and the global economy fell into the most severe recession in decades.