The Dow Jones Industrial Average breached the 23,000 mark for the first time on Tuesday, led by a more than five-percent gain in UnitedHealth, Reuters reports.
The broader market was weighed down by losses in industrial, financial, and technology stocks.
Shares of the largest US health insurer touched a record high after the company reported a stronger-than-expected profit and raised its full-year earnings forecast.
At 11:11am ET (3:11 GMT), the Dow Jones Industrial Average was up 40.93 points, or 0.18 percent, at 22,997.89.
The S&P 500 was up 0.4 points, or 0.015639 percent, at 2,558.04 and the Nasdaq Composite was up 2.90 points, or 0.04 percent, at 6,626.90.