LinkedIn don't provide contact information for companies but there are some tools that extract companies information and find contact information based on extracted information.
LinkedIn is the most professional of the major social networking websites. It is a platform for more than 80% of a business's social media leads! And, since it is largely focused on B2B connections, LinkedIn must be considered part of social media marketing strategy.
XING is an European social network website for business professionals. As with LinkedIn, XING's goal is to help members find jobs or get in touch with people they have worked with. On Xing you can find professionals of every category.
Linked Scraper used to extract LinkedIn profiles data like profile link, First Name, Last Name, Email, Phone Address, Twitter id, Yahoo messenger id, Skype Id, Google Talk ID, Job Role, Company Name, Address, Country, Connections