Enter provides a good analysis as usual. I would also recommend to include all subdivisions/companies that you are going to mention through the body of the message in the opening list of "associated brands".
Given that you are obviously setting this up to introduce the reader as the latest new person inducted into Security, you might do better framing it something like:
Welcome to Caucasus Superstore Incorporated.
We're excited to have you onboard as the newest member of Caucasus Security and hope this information will help you prepare for your first day as part of the family. Caucasus and all it's affliated brands including, but never limited too, FreshCaucasus Food Basics, Caucasus Home, Caucasus Automotive, Caucasus Support and Cacausus Fertility Assistance attracts shoppers from all over the world.
Caucasus is also an awkward company name and unless a connotation to the Caucasus mountains or being Caucasian is intended, you might consider a less awkward word since it is going to come up alot.