A good place to find upto three years of press releases and other news released by companies who are members of the PR Newswire organization. PR Newswire serves more than 50% of public companies in the United States, including over 70% of the Fortune 500, and more than 40,000 other companies and organizations worldwide with distribution of financials and other material news that may affect the valuation of their stock. Between 600 and 1,000 news releases are sent out every weekday to the full gamut of US media and financial organizations as well as to over 70,000 journalists. (source Factiva)
Special Note: For UNC-Chapel Hill users PR Newswire is also included in Factiva and in Nexis Uni.