A new order is emerging on Wall Street after the worst crisis since the Great Depression  one in which just a couple of victors are starting to tower over the handful of financial titans that used to dominate the industry.

On Thursday, JPMorgan Chase became the latest big bank to announce stellar second-quarter earnings. Its $2.7 billion profit, after record gains for Goldman Sachs, underscores how the government’s effort to halt a collapse has also set the stage for a narrowing concentration of financial power.

“One theme here is that Goldman Sachs and JPMorgan really have emerged as the winners, as the last of the survivors,” said Robert Reich, a professor at the University of California, Berkeley, who was secretary of labor in the Clinton administration.

Both banks now stand astride post-bailout Wall Street, having benefited from billions of dollars in taxpayer support and cheap government financing to climb over banks that continue to struggle. They are capitalizing on the turmoil in financial markets and their rivals’ weakness to pull in billions in trading profits.