Some of the worst-performing funds in 2014 were ones managed by John Paulson, who rose to fame by making billions of dollars from a shrewd bet against the US housing market in the runup to the financial crisis.

If Steven A Cohen’s investment firm were operating as a hedge fund, it would have been one of the industry’s most profitable in 2014. Mr Cohen’s famil(...)

President of Spanish wifi company Gowex, Jenaro Garcia, who announced on Twitter last week that the company’s accounts had been falsified for more than four years. Photograph: Angel Diaz/EPA

To many, attempting to profit from stock market falls is immoral and parasitic. Short sellers, however, see themselves as the detectives of the stock (...)

An employee walks past a logo of Alibaba Group at its headquarters on the outskirts of Hangzhou, Zhejiang province. The Chinese ecommerce giant is about to file for an initial public offering (IPO) in the US, with talk of a $170 billion valuation. Photograph: Reuters

Chinese ecommerce giant Alibaba is about to file for an initial public offering (IPO) in the US, with talk of a sky-high $170 billion valuation(...)

Michael Lewis, author of Flash Boys: A Wall Street Revolt, speaks during a Bloomberg Television interview in New York, on Wednesday, where he discussed high-frequency trading and the structure of the US equity market with Brad Katsuyama, chief executive officer of IEX Group Inc. Photograph: Chris Goodney/Bloomberg

To explain claims of stock market rigging in the latest scandal to rock Wall Street, one US television news network resorted to a rather crude (...)

 Trading in Apple  options have surged after investor Carl Icahn revealed via Twitter  a large stake in the tech company, which he believes to be undervalued. Photograph: Chip East/Reuters

Activist investor Carl Icahn said he has amassed a “large position” in Apple and believes the stock could be worth as much as $700 a share if chief ex(...)