Keith Bedford/ReutersStocks slipped into the close in a mixed day of trading on Wall Street. The Dow held an all-time high for much of the day before fading into the close, but ending slightly positive. The Nasdaq and S&P 500, on the other hand, dropped on the day. Additionally, oil and oil company stocks surged in trading as OPEC finally agreed to a production cut for its member countries. We've got all the headlines, but first, the scoreboard: Dow: 19,124.95, +3.35, (+0.02%) S&P 5o0: 2,2198.85, -5.81, (-0.26%) Nasdaq: 5,323.68, -52.64, (-1.05%) WTI crude oil: $48.97, +$3.74, (8.27%) OPEC formally agreed to a production cut.