Key TakeawaysThe Trade Desk beat estimates for fourth-quarter revenue and current-quarter guidance, sending the company's stock nearly 20% higher.The company forecast revenue for the current quarter of at least $478 million.The company has around $700 million available for share buybacks.The Trade Desk (TTD) shares surged almost 20% Friday, after the advertising-technology firm posted strong fourth-quarter sales and guided toward current-quarter revenue that topped analysts' forecasts.The company said that ...