Not State-sponsored, but State "affiliated".
(Short version, because I lost everything I had typed in...)
Solaris VII TGW (Player's Book), pg45
DAVION ARENA
..
Owner: United Federation Corporation
History:
In 2786 the Fed Suns undertook construction of the largest and most sophisticated arena on Solaris. A consortium of corporations, lumped under the collective title of United Federation Corporation, undertook the actual construction.
But there's an interesting possible break in lore here:
In 3028, a mercenary unit called the Gray Death Legion recovered a Star League data core on Helm ...
In addition to the military secrets, the core contained information that led to significant advances in holotechnology, communications, visual display, and information transferal...
The new Davion arena would be a state-of-the-art facility exploiting all aspects of the new technology.
Because the arena was originally built when Star League-era technology was still prominent, it's possible that either it never possessed anything as "state of the art" as was re-discovered, that the systems once in place had degraded and were totally forgotten, or, the writing is a bit off.
Solaris VII TGW (Player's Book), pg49
THE FACTORY
Owner: Free Worlds Industries
History:
Free Worlds Industries, a limited partnership formed in the late 2700s, undertook the massive project...
CONFIDENTIAL
TO: Nora Hammaker, CEO, Earthwerks-FWL
FROM: Carlton Bergman, CEO, Irian Technologies
RE: Solaris VII Arena
This is to inform you that Irian has recently obtained the abandoned Fleetham Industrial Park on Solaris VII. Rather than restoring it to working condition, we have been toying with the idea of converting it to a 'Mech arena, to serve as the official Free Worlds League stadium, just as the other Great Houses have done with their own arenas.
Despite our high level of resources and considerable technological expertise, Irian cannot handle such an undertaking alone. For this reason, we have decided to contact you informally to discus the possibility of forming a consortium or limited partnership to investigate the project.