There are thousands of ways companies can make prices of their stocks rise pretty fast. In January for example, there was speculation that Samsung was interested in buying Blackberry. Following the publication of the false news report by Reuters, Blackberry's stock shot up [by] 30%. Later when Samsung declared that they no plans of buying the Canadian company, the value of Blackberry's stock plummeted once again. Lesson learned from this? Don't trust all the news you read because they could lead you to make bad investment choices and you'll end up losing a lot of money.