US STOCKS-Dow, S&P flat; Nasdaq falls after F5 results By: Reuters: Company News January 20, 2011 at 15:15 PM EST * Dow off 0.05 pct, S&P off 0.1 pct, Nasdaq off 0.6 pct * For up-to-the-minute market news see [STXNEWS/US] (Updates to afternoon) Read More >> Related Stocks: Alcoa Exxon Mobil F5 Networks JPMorgan Chase & Co Parker-Hannifin Standard & Poors 500