Due Diligence: Company Information for Law Students (by Matthew M. Morrison -- Law Library Journal, 2016) is an excellent article included here for reference. The article includes references to many sources with some (but not nearly all) included in this research guide.
This article states: "Many law students are placed with corporate law firms whose clients are overwhelmingly companies. While many law school courses focus on doctrine, students need to learn company information and where to find it."
According to a survey of 300 hiring partners (via a LexisNexis 2015 white paper, mentioned in the article), "Skills identified as important include:
This Research Guide/LibGuide focuses on finding Company Information in both a legal and business sense. We have included materials from Lexis+, Westlaw & Bloomberg Law and also from the SEC's EDGAR (Electronic Data Gathering, Collection & Retrieval) website.
This guide does not include all resources (legal or business), but is a basic guide to finding company information from a legal researching standpoint.