Datastream B2B Data is one of the most trusted company data providers. They collected employee and contact data for millions of businesses. Datastream updates their database monthly.
Krill Technologies B2B Email Marketing Cluster : over 25 million company emails from a variety of industries worldwide
EasyLeadz Custom B2B Data provides data for B2B marketing campaigns. They provide quality curated data, not just simple email lists
B2B Email and Mailing Lists by eSalesData provide businesses with accurate target audience data for use in marketing campaigns.
Validatis B2B Data lets you acquire company data directly from the primary source.