Shares of Windstream Holdings (NASDAQ: WIN) rose on Friday, surging as much as 19.2% higher as of 1:20 p.m. EST. The stock is finding its bearings after a tumultuous Thursday, when a hard-to-interpret earnings report first sent share prices 13% higher. The gains didn't last, and Windstream closed Thursday's session 13% lower instead.The fourth-quarter report showed sales rising 14.5% year over year to land at $1.5 billion.