Option players have displayed a growing demand for Qihoo 360 Technology Co Ltd (NYSE:QIHU) calls of late per data at the International Securities Exchange (ISE) Chicago Board Options Exchange (CBOE) and NASDAQ OMX PHLX (PHLX). The stock's 10-day call/put volume ratio (which measures buy-to-open activity) is docked at 4.68 compared to its 50-day call/put volume ratio of 1.07. Plus this shorter-term ratio ranks higher than 90% of other such readings taken in the past year indicating calls have been scooped up over puts at a near annual-high pace in recent weeks. Further highlighting this developing trend is the stock's ...