Bulk effort - making a contact within a company the Primary contact

We are trying to export a list of Companies and Contacts, but are seeing that the Company’s with contacts (but the contacts are NOT listed as the Primary contact), are not being exported during the Company Export. IS there a way to "via a bulk method’, make any contact (ie: likely the first one) listed under any Company, the “Primary Contact” (if that box is NOT currently clicked)???