It is considered a megacorporation due to the fact it has influence in the government and is the major supplier for the military and consumers. Although the company created SHODAN and that led to the Citadel incident, TriOptimum is just considered a bystander.
TriOp saw its golden age thanks to the Hays-Bishop Bill. Ιn 2059 TriOp absorbed whatever remained of the United States and later it purchased the rights to orbit Saturn. There the Citadel Station was constructed.
It competed with a company called TetraCorp.
During the events of System Shock, TriOptimum was at its peak. Being a Megacorporation and government, there was nothing in the world that TriOptimum could not provide.
On April 7, 2072, the arrest of the Hacker would unknowingly set the company down a destructive path. TriOptimum executive Edward Diego, who was secretly funding illegal experiments, offers the Hacker both a chance to drop the charges and a military grade interface if he disables SHODAN's ethical restraints.
During the Hacker's coma, all TriOptimum workers aboard Citadel Station were either mutated or converted into cyborgs by SHODAN. It was the Hacker, with the help of Rebecca Lansing, a TriOptimum counter terror consultant, who managed to stop SHODAN and save humanity. Upon returning back, the company offered the Hacker a job, but refused and went back to his own ways.
Death and Rebirth
Once news spread of how humanity was very nearly destroyed by SHODAN, TriOptimum's stock plummeted, smaller corporations that had contracts with it withdrew, employees resigned en masse, workers whistle-blew, reporting massive labor and ethics violations, and the public was outraged.
Lawsuits flew in every direction from families who lost loved ones on the station and from work violations. At first TriOptimum would pay the lawsuits directly out of pocket, but soon the money began drying up. With no investors wanting to put money into the company and no new business contracts, TriOptimum became a shadow of its former glory. The creation of the UNN was the final nail on the coffin; as TriOptimum could not function other than paying lawsuit settlements.
But TriOp had thousands of patents, trademarks and copyrights and hundreds of consumer brand names which were still held in good esteem, even 30 years later, when the SHODAN incident began to be forgotten. It was not until the arrival of the shrewd Russian ex-gangster Anatoly Korenchkin, who bought 51% of the Corporation with his millions of black market gains. Korenchkin rebuilt the company by exploiting the brands, and brought TriOptimum back to its feet.
Although the UNN is the official government body, Korenchkin also leaned on his UNN contacts to relax technology restrictions even further. The newly re-licensed TriOptimum reestablished itself and the company became the sole supplier of wares from military hardware to consumer goods. Soon, the company's hold on the UNN was well known, as neither could live without each other.
Korenchkin's major asset was the employment of Marie Delacroix who worked on the first FTL starship prototype. Korenchkin saw in interstellar travel a new market that would consolidate TriOp's monopoly.
System Shock 2
By this time, TriOptimum had grown back to the giant Megacoporation it was before. Virtually everything in the world had TriOptimum logos on it, from small lighter matches to military hardware. Even the mighty UNN was powerless to oppose TriOptimum interests; many of its members were stockholders and had deep connections.
When the Faster than Light engine was proposed to the TriOptimum board, the company would become not only the biggest consumer corporation, but a monopoly in interstellar space travel as well. Soon, construction of the Von Braun was underway. By the time the player awakes from stasis almost all TriOptimum workers have been consumed by The Many.