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The top 5 happiest places to work

Happy office workers employees

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Whistle while you work

Not happy at your day job? Glassdoor Research—which recently found a correlation between staff job satisfaction and stock performance—announced the results of its 7th annual Employees' Choice Awards, which honors the companies its survey respondents voted as the best places to work. The 2015 lineup officially announced in December by Glassdoor lists the top 50 large and top 50 small-to-medium companies in both the U.S. and U.K. (Employee feedback at Glassdoor's Web poll site is still active, so some numbers may change after press time.) CNBC.com takes a look at the top 5 big firms at the head of the U.S. list. Brush up those résumés.

—By CNBC's Kenneth Kiesnoski
Posted 19 March 2015

Todor Tsvetkov | Getty Images