The Hoover's Online database provides access to in-depth company profiles for more than 40,000 companies, public and private, worldwide, as well as to financial information, news, and industry information. This database is an excellent starting point for company research.
The UW Libraries has a library account with Hoover's Online, with subscription content available from computers attached to the campus network--and from off-campus for authorized University of Washington library users, with a valid UW Net Id. The UW Libraries does not have access to the much more expensive corporate-oriented Pro Plus or Pro Premium levels, which permit various kinds of list building.
(For authorized University of Washington users with a UW Net ID)