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No. 2,616 Whelan Security St. Louis, MO

	Year	2008
	Industry	Security
	Founded	1949
	Growth	139.8%
	2004 Revenue	$41.2 million
	2007 Revenue	$98.8 million
	Employees	3,500

What it does:
Provides outsourced and contract security staffing services to a range of industries, including corporations, institutions, shopping centers, and government facilities.

Why it's growing:
The company, with offices in 15 states, expanded geographically into seven new markets spanning Colorado to Arkansas, primarily due to extensions of agreements with existing customers.

What's noteworthy:
The security firm is a family business operated by the Twardowski clan since 1949, when it was a security patrol company providing service along the St. Louis riverfront.