Hedge Fund - JANA Partners

Jana Partners, QEP Resources: In a 13D just reported to the SEC, activist Barry Rosenstein's Jana Partners disclosed a 7.5% stake in QEP Resources Inc (NYSE:QEP).

Tiger Global Management reported ownership of some 53.5 million shares of London-listed BBA Aviation plc (LON:BBA).

Activist hedge funds: While hedge funds follow many different investment philosophies, the industry can be boiled down to two types of managers: the activists and the passivists.

While hedge funds subscribe to many different investment philosophies, this space can be boiled down to two types of managers: the activists and the passivists.

 Outerwall, Pandora, Achillion, hedge funds: It’s no secret that at Insider Monkey, we track hedge funds (discover why here).

Jana Partners, Agrium: In a new 13D with the SEC, Barry Rosenstein's Jana Partners reported just a 2.7% stake in Agrium (NYSE:AGU).

Activist investing: When hedge funds and other investment managers publicly disclose new holdings after normal trading hours, some investors can be caught off-guard.

2013 hedge fund returns: Many financial journalists commit the travesty of reporting improper return figures every quarter.

Here are the eleven most important moves made in the hedge fund world this week. Bill Ackman reduced his Herbalife short significantly, replacing it with long-term put options. Dan Loeb ups his activist campaign at Sotheby’s, snatching 9.