Is it convenient to talk at the moment? <a href=" <a href="http://singaporevideophoto.com/?page_id=106#urge" rel="nofollow" target="_blank">http://singaporevideophoto.com/?page_id=106#urge</a> ">tadalist</a> Pioneer Natural Resources was the S&P 500's biggestpercentage gainer after reporting second-quarter results. Thecompany's shares closed up 12.5 percent to $174.15, afterhitting an all-time high of $180.99 earlier.<br />