It is brand new feature for admin accounts only for beta users. You can increase your followers by simply using invitation:
1- Go to your Linkedin Page admin view, click “admin tools” .
2- Than see invite connections in your company page account.
3- You can invite your connections to follow your page that are not following your page or have not yet been invited.
Pages will be really a thing on LinkedIn soon. The feature is not yet available to all admin accounts or pages yet.