Economics

Conglomerates
Conglomerate businesses are common on a colony, continental or star system wide basis but very few have remained in existence on an interstellar scale for long periods of time for numerous reasons. The primary reason for the break-up of multi-stellar conglomerates have been financial. It has simply proven too difficult to fairly value so many disparate parts scattered over numerous systems.

Financial Services
Due to communication delays, most financial services and especially share trading has been limited to single systems.

Shipbuilders
=== Weapons Manufacturers ===