Shares of fuboTV Inc. /zigman2/quotes/201214080/composite FUBO -0.52% were down 3% in extended trading Tuesday after the live-sports streaming service reported spikes in quarterly revenue and subscribers. The company said fourth-quarter revenue nearly doubled, to $105.1 million, from a year ago as its number of subscribers improved 73% to 548,000. In a letter to shareholders , fuboTV said it expects sales of $101 million to $103 million in its current quarter, and subscribers of 520,000 to 530,000. FuboTV's stock is up an astounding 373% over the last 12 months. The broader S&P 500 index /zigman2/quotes/210599714/realtime SPX +0.33% is up 29% over the past year.