The history of a company will be included in a company's annual report or on a company website.  Local newspapers, journals as well as memoirs and personal papers can be very useful when researching the history of a company. 

Go to the Business Library's Company & Financial Information section for links to useful resources including a link to the following suggested resources.

Business Insights Essentials:  Provides company history profiles for thousands of the “world’s largest and most influential companies.”  Go to the Companies tab which links to the International Directory of Company Histories for a detailed history on a company. 

ProQuest Historical Annual Reports 

ProQuest Central:  Provides historical newspaper articles. 

You may also want to use WorldCat to search for memoirs, company histories, personal papers, and other publications and archival collections relevant to the history of a company.