It isn’t enough to say that you were at a company or in a position from one time to another. You really ought to add a note about that position with some information that might be of interest to a visitor to your profile.
The same principle applies to your education and other aspects of your profile. Don’t just list the positions or milestones in your education, talk about them a little and share what you learned, experienced or did. When you do that you show visitors a little more of you, the person, and they begin to feel like they know you a little better and people like to work with people they feel they know.
So take a look at your profile and consider whether it is time for you to do an update.