Business, industry and trade associations can be excellent sources of research, statistics, and current information on industries including lists of current member firms. These associations often publish this information on their own web sites.
Passport (Library Database): Euromonitor's industry reports include lists of official sources (government agencies) and trade associations in the Sources section of each report.
IBISWorld Industry Reports (Library Database) routinely list such associations in the Additional Resources section of each report.
First Research Industry Profiles (available in the Mergent Intellect Library Database) include a list of Industry Websites and a glossary of Acronyms including industry associations.