“Hide Company” is a feature that enables you to hide a particular company’s listings from appearing in your search results. To hide a company, go to the search results page and click on the “Hide Company” link that appears in the job listings of the company you want to hide. You can hide up to ten companies.
To unhide a company or view your list of hidden companies, click on the "More Options" link at the top of the search results page. Then click on the “Companies You've Hidden” link from the drop-down menu.