The S&P 500 was virtually unchanged, a day after nudging to its latest all-time high, and is on track to close its fourth winning week in the last five. The Dow Jones Industrial Average was up 141 points, or 0.3%, as of 9:35 a.m. Eastern time, and the Nasdaq composite was slipping by 0.1%.

The Dow Jones Industrial Average ended nearly flat on Friday after hitting a record high in morning action — riding a wave of market optimism and a timely push from the “Oracle of Omaha.”