- ARG - It is a pretty safe bet that this is the Argon Government.
- HOL - Home of Light? This doesn't seem likely, as X4 is not suppose to be connected to the events of X Rebirth
- TEL - The Teladi Company
- XEN - Xenon
There are probably more that I missed, but till more information is released, there isn't much more to say about these. Most of these are likely to be companies like the Albion Energy Subsidiary or TerraCorp.
If anyone has more info on what these might be pass it on. When I learn more I'll probably create a page for them.