Need names and emails of company leadership in US & UK

We're looking for the names of the chairmen and board members of certain sized companies that may be listed or private. It will likely be two to three thousand names (there might be overlap as board members tend to sit on several, sometimes similar boards). We're looking for name, organisation, email address, any social media accounts.
In your response, please quote 'CFU2020-DS' at the very top. Please let us know how long it will take you and how much it will cost with a sliding scale, where you have one.