Research contact details and demographics of organisations

Currently we have a list of registered businesses within a particular region. This list contains little more than basic information. We need someone to provide research to deliver more information about these businesses, which may require online research as well as phone calls to find the details of key contacts. A spreadsheet outlining the fields to complete will be provided and we need the final list to include 100 businesses that have between 20 and 100 employees and the specific contact details for the CEO or Managing Director, as well as the website address and a summary of the company from their website.