For the third year running, Inc. magazine has named Catalyst to the Inc. 5000, an exclusive ranking of the nation’s fastest-growing private companies. In this year’s ranking, Catalyst came in at 3,162. Of companies headquartered in Denver, Catalyst ranked #59 on the list.

In its ranking, Inc.reported that Catalyst had a three-year growth rate of 66% and 2011 revenue of $30 million.

Last year, in the 2011 Inc. 5000, Catalyst was ranked 2,237 overall and 49th among companies headquartered in Denver. In the 2010 ranking, Catalyst was listed 1,117 overall, with a 269% three-year growth rate, and 76th among U.S. software companies.

The Inc. 5000 represents a comprehensive analysis of what it calls “the most important segment of the economy—America’s independent entrepreneurs.” Complete results of the Inc. 5000, including company profiles and an interactive database that can be sorted by industry, region, and other criteria, can be found at www.inc.com/5000.

The full Catalyst announcement of this year’s ranking is available here.