The Dow Jones Industrial Average was up 0.8 percent to 10,537.60 on Thursday, led by a 3 percent rise in shares of American International Group to $55.71.

The rise in AIG’s shares came after the announcement that the attorney general of New York had filed a lawsuit against the company and two former executives.

The Nasdaq was higher as well, buoyed by gains in the semiconductor sector. The Nasdaq composite gained 1 percent to close at 2,071.24. Semiconductors were aided by the release of a report by IC Insights that predicted that worldwide sales of computer chips would rise by 4 percent this year. Shares in Intel, the world’s largest chipmaker, gained 1.4 percent to $27.37. The S&P 500 was also up, 0.6 percent to 1,197.66.

The markets were helped by an upward revision of first-quarter gross domestic product growth figures. The new figures say that the US economy grew by 3.5 percent last quarter. This is up from the previously reported 3.1 percent.

The new figure was still a bit below the expected 3.6 percent growth, but at least one analyst said that a higher number would have indicated that the recent interest rate hikes by the Federal Reserve were not doing what they were supposed to do for the economy.

Homebuilders found the new figures especially good news because they mean that it is less likely that the Fed will begin to raise interest rates at a faster pace. Home construction and financing group Toll Brothers was their shares rise 6.7 percent to $91.50.