The business database Factiva is a good starting point for researching individual companies and broader trends within the contemporary entertainment industry.
Citation: Factiva does not offer a tool to generate citations, unlike some other academic databases. You will have to create a citation yourself according to your citation style's rules for citing websites or electronic resources. Sample:
"The Walt Disney Company. Company Snapshot." Factiva, https://global-factiva-com.proxy.library.emory.edu/pcs/default.aspx?napc=K&f=DSNYW&fcpil=en. Accessed September 24, 2019.
If you are citing trade newspaper articles, just use the standard rules for citing newspaper articles.
Some library databases offer full text and indexing for industry trade journals, including Variety, Hollywood Reporter, and Broadcasting & Cable. You can pull up results on topics using regular keywords or the controlled subject headings specific to those databases.
For access to Variety specifically, try:
Film and Television Literature Index with Full Text: 1999-present.
Entertainment Industry Magazine Archive - 1905-2000.