Finding a company's actual suppliers can be challenging. Many companies do not want to reveal this information to their competitors for obvious reasons. A lot of this is considered proprietary or private information.
Two databases have searched the news for you. Bloomberg & Mergent Horizon list suppliers as part of their coverage of company relationships.
In addition, searching SEC filings, the 10-K, 10-Q and 8-K reports, will often result in information about a company's suppliers and partners.
You can search newspapers and trade journals for a mention of a company's suppliers. Search the full-text of the articles. Sometimes suppliers are willing to report their relationship or contracts with a major company. Go beyond just searching with the keywords - suppliers or supply chain. Look for references to new contracts, joint ventures, partnerships, distributors, etc. Use the following databases:
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Factiva
Provides global business and financial news from newspapers, magazines, newswires, websites and business blogs.