Here's a list of the top companies for investors. These companies are on the radar for offering some of the best returns to shareholders and are a financial dream come true for investors. What are the best American companies to invest in? Anyone interested in investing in an company in the U.S. should look at these businesses. Financial advisors assure investors that these are the best companies to invest in. These corporations are ranked as the top companies to invest in in America. You can bet that several famous investment bankers will agree.