The following databases and government sites can be used to find information on company subsidiaries: 

Bloomberg is a computer system for professionals in business (primarily finance) and other industries to access, monitor and analyze real-time financial market data and place trades on its electronic trading platform. Bloomberg Terminals provide detailed data on a company's subsidiaries. The system also provides up-to-date news, price quotes, and messaging across its network. The Bloomberg Terminals must be used on site at a GSU location and cannot be accessed remotely. Visit: Bloomberg Terminal locations to find out where to access them on campus.

LSEG Workspace - (formerly Refinitiv) can be used to retrieve a company tree by typing the company name or ticker symbol in the search bar, followed by the word TREE (e.g. Exxon TREE). Alternatively:

• From a company's overview page, click the Open Company Tree Structure icon to the right of the company's name
• Filter and customize the display as desired. Grid View, Company Tree View, and Geographic View are available. 
• The tree can be exported as an Excel file 

ReferenceUSA - is a directory of U.S. and Canadian businesses, residents, healthcare providers, and other optional modules. Business directory entries provide corporate family trees that can be used to view subsidiaries. 

• From a company's overview page, find "Corporate Tree" in the sidebar navigation box
• Click on the icon to open the corporate tree and view subsidiaries
• The tree can be exported in several formats, including as an Excel file

EDGAR - Financial reports of U.S. corporations from reports submitted to the Securities and Exchange Commission (SEC). Includes annual reports, quarterly reports, balance sheet, income statement, security activity and analysis, and much more. See SEC help guide at https://www.sec.gov/oiea/Article/edgarguide.html

Securities & Exchange Commission (SEC) - the SEC requires public companies, including publicly-traded banks, to disclose specific financial and other information to the public. A list of subsidiaries must be disclosed to the SEC as Exhibit 21 to registration statements filed on Forms S-1, S-4, S-11, F-1, F-4, 10.

For more help, ask the business librarian.