After Yahoo! (NASDAQ:YHOO) appointed a new CEO yesterday, Jefferies downgraded the company’s stock to Hold from Buy. The stock closed yesterday at $15.78 on volume of 35,633,800 shares, above the average daily volume of 20,286,228.In the past 52-weeks, shares of Yahoo! have traded between a low of $11.09 and a high of $18.84 and are now at $15.78, which is 42.3% above that low price.Yahoo! is currently above its 50-day moving average (MA) of $15.70 and above its 200-day MA of $15.31.