Headquarters: London, UK
2010 Revenue ($ millions): 15,746
Rank: 11

What makes it so great?

It's 5 o'clock somewhere and, chances are, that 5 o'clock is happening at Diageo. With bars at many of its locations, employees receive brand education while socializing with their colleagues. In Australia, the pub is open three days a week and in Diageo's Canadian and U.S. offices, there are weekly "pub nights" with complimentary food and drinks.Though the excess of alcohol may keep workers giddy with delight, the open and opportunity-filled work environment is really what keeps them happy in the office. "Diageo is a place where no matter who you are, you have a voice at the table. A well-framed proposition or idea will get air time, be fairly considered, and launched if it has legs," says an employee.

Last updated October 28 2011: 4:50 PM ET