Confidential Sales Quote Is Information On A Company's Relationship With Their Suppliers And Customers Considered Confidential?

Is information on a company's relationship with their suppliers and customers considered confidential? - confidential sales quote

I work in sales in the area of logistics and supply chain. I am in the search for a Web site a list of providers were interested purchasing companies. For example, if the company I call X and ask who your customers are able to provide this information?