A list of Coloradan companies. Many well known Colorado companies have been included. While this list isn't definitive, these are most of the top businesses in the state of Colorado. As a country, the United States has encouraged entrepreneurship throughout much of its history. The state of Colorado is no exception to this rule, and new businesses are started in Colorado daily, ranging from corporations to LLCs to partnerships to sole proprietorships. This list, however, is mostly focused on the largest corporations in the state of Colorado.What companies are headquartered in Colorado? There are more than you may expect along with some big names you'll for sure recognize.