Corporate clients are companies or clusters of companies with one owner or a constant business group. If your business fits in this description the accounting company could provide you with package price for all companies with averaged monthly fee. The convinience of this proposal is the fact that you do not need to accept several offers and to sign several different contracts. You will have one for all and the main criteria will be not the number of the companies, but the volume of work.
Also take into consideration, that if you trust the Vesta consult wth more than one company, you can obtain some discunts for a loyal client.
For more information about the formation of the prices you can see Packages for companies