Piper Jaffray's Rating Change Only Had Short-term Impact, Myriad Genetics Up 6.4% (MYGN)

A week ago, Piper Jaffray downgraded Myriad Genetics from Overweight to Neutral. The stock closed at $20.96, which is 6.4% higher than the price one week ago ($19.70).Myriad Genetics...