US STOCKS-Dow, S&P lower on mixed earnings; Nasdaq rises
* Amazon jumps to record high after posting unexpected profit
* Visa rises after results beat expectations
* Biogen slumps after slashing forecast
* Dow down 0.09 pct, S&P down 0.12 pct, Nasdaq up 0.16 pct (Updates to open)
By Tanya Agrawal
July 24 (Reuters) - The S&P 500 and Dow Jones industrial average were lower on Friday while the Nasdaq composite gained amid a mixed bag of earnings from big companies and the downward spiral of commodities.
Metal prices hit multi-year lows as weaker-than-expected data from China and the euro zone raised concerns about global growth while oil prices neared four-month lows.
The three major indexes were poised to end the week in the red after disappointing corporate results and forecasts added to concerns about the U.S. profit outlook.
Amazon.com shares jumped as much as 20.4 percent to a record high of $580.57, a day after the online retailer posted an unexpected quarterly profit. Continuación...