About one in ten employees in the US -- 10.5% to be precise -- are
The figures can be found in the Statistical Abstracts of the United States:
Statistical Abstract of the United States
In particular, at this link:
you find the labor statistics:
Labor Force, Employment, and Earnings
and in Table No. 597:
Employed Civilians by Occupation, Sex, Race, and Hispanic Origin: 2003
you can see the following:
Total number of employees in the United States: 137,736,000
Total number of Management occupations in the US: 14,468,000
FYI, the largest categories of managers were CEO's (1,617,000) and
Financial managers (1,041,000).
I trust this information fully answers your question.
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search strategy -- Used bookmarked site for the Statistical Abstracts