A list of Michiganian companies. Many well known Michigan companies have been included. While this list isn't definitive, these are most of the top businesses in the state of Michigan. As a country, the United States has encouraged entrepreneurship throughout much of its history. The state of Michigan is no exception to this rule, and new businesses are started in Michigan 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 Michigan.What are some companies headquartered in Michigan? For starters, there are the great American car companies like Ford and GM. You may be surprised to learn that Kellogg's is based in Michigan as well.