TIPS on finding trade sources:
Tip: The Form 10-K is a government source. Look in the Business section of a public company's Form 10-K (SEC filing) to find information about its suppliers and supply chain.
Start with the IBISWorld database for an industry supply chain overview. This overview will be for the "industry," not for individual companies, but you can apply the industry information for your analysis.
Tip: Start by looking for WSJ articles. Try Google to find WSJ articles. Example: "fast food" site:wsj.com
Try the databases linked below to find general business news articles (ex: from Forbes, local business newspapers).
Public companies will often name some of their top suppliers on their corporate website or in reports such as the Form 10-K. Use the company's website search box to find information on suppliers and/or look for trade and news articles that mention suppliers.
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