if you have -any- entries missing all three of these: first name, last name & company, you may be missing one or more contacts.   Fix these contacts in Microsoft Outlook (or Outlook Web Access) and wait a few minutes to see if they appear.  If not, you should perform a full resync of your BlackBerry to BES/Exchange.   Instructions can be found here:

How To: Force my blackberry to resync all items with my Exchange Server using BES