NEW YORK, Aug. 20 (Xinhua) -- U.S. stocks traded mixed on Monday with the Nasdaq retreating modestly after two strong previous trading sessions.

At midday, the Dow Jones Industrial Average advanced 107.14 points, or 0.42 percent, to 25,776.46. The S&P 500 was up 7.07 points, or 0.25 percent, to 2,857.20. The Nasdaq Composite Index was down 2.80 points, or 0.04 percent, to 7,813.53.

The Dows gained with Nike and Boeing among the best performers. Shares of the companies rose 3 percent and 1.34 percent, respectively, round midday.

Nine of the 11 primary S&P 500 sectors traded higher with energy and materials leading.

Tesla and NVIDIA were among the major laggards in the Nasdaq. Shares of both companies traded more than 1.5 percent lower in midday trading.

U.S. stocks traded on an upbeat note during the past two consecutive trading sessions as hopes for the resumption of the U.S.-China trade talks injected optimism.

For the past week, the three major indices posted mixed results, with the Dow Jones Industrial Average advancing 1.41 percent, the S&P 500 up 0.59 percent, and the Nasdaq sliding 0.19 percent. Enditem