Sharing Company Updates on LinkedIn
Step 1 - Navigate to the Company LinkedIn Page
Step 2 - Find Post to you want to Promote
Step 3 - Click on 'Share'
Step 4 - Post Your Update - Write a quick update to your connections - then choose the drop down where it says "Public" and Choose "My Connections" and hit Post
This will share the Company Update to all of your connections on their Feed.