Corporation: Bablyos

Becomes Byblos (Not Babylon as one might expect).
They liaison between companies as mediators, and are also a neural shipper of goods. Babylos also offers neutral ground when you don't trust Dire's room in your arcology. The main other speciality they have is vat gown oil for cooking or as a biofuel (most vehicles are a combo of solar powered/rechargeable electric batteries, with bio fuels for long haul purposes so this still has a large audience.)
Software and hardware that help with mediation (linguistics, secure communications diplomatic training) are also natural areas of study. As a corporation they seem rather eclectic, until you see the uniform thing binding them together is bringing people together. Where two or more people meet form different companies, there's a chance Byblos might make a profit of some kind.
They are generally seen as a less of a "threat" form outside corporations, which has also allowed them to flourish.

Defences

The Arcologies themselves are hard to siege due to how they are constructed, and their defences are a mixture of tech, and bio engineered. More then other arcologies the outsides have solid sub building one would need to pass unless doing an aerial assault, and the sub buildings leading up to the main Arcology contain surface to air missiles that also deter attack. It is likely there reputation help's as a defense too.

Assets

Besides the above they manufacture organic oil to use in cooking and as a backup vehicle fuel. They use large bio vat's, with genetically altered crops that produce oil quickly, and uses the waste from the Arcology that houses it to feed itself. They also do a lot of construction when new construction happens, and create equipment for said purposes too.

Alternative Name(s)

Mediators, Babblers