A list of Louisianan companies. Many well known Louisiana companies have been included. While this list isn't definitive, these are most of the top businesses in the state of Louisiana. As a country, the United States has encouraged entrepreneurship throughout much of its history. The state of Louisiana is no exception to this rule, and new businesses are started in Louisiana 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 Louisiana.