To kick off this week's episode of "The Long and the Short," brought to you by TradeStation, we take a look at some of the stocks making big moves today. We start with Under Armour, which slashed its earnings forecast for the fiscal year, from $0.37 to $0.40 a share to $0.18 - $0.20. Shares fell as much as 15% after the news. Qualcomm shares were also down after reports that Apple may stop using its chips in its iPhones and iPads. On the positive side, Mastercard shares saw a spike after better than expected earnings and 11% growth in transaction volumes during the quarter. And Sony also seeing a jump in its stock price, as strong demand for the PlayStation 4 helped profit for the first half of its fiscal year come in ahead of expectations.