From what I know, companies or grand companies (like this name better) Are like gathering a few Linkshells together abd make a guild. They are basically ffxiv guilds. These will be more for event focus, such as the end game. Much like WoW has. If they keep to what they said you can only join 1 gand company. but many different linkshells as there will be alot more to them then just a Linkshell. That is all the info I read since tanaka said them.