Celtic Triquetra is one of the most influential and successful mega-corporations. Expert monument builders, they were the leading power in all nuclear wars. They were the first mega-corporation that built space elevators, and in 2445, they completed the first lunar base. In 2486 they spearheaded the building of the Nexus space station frame.
After the Interhuman War, with the original Nexus station destroyed, led the construction of the Neo-Nexus. They favor mechas and synths and are quite strong on the military front. Unsurprisingly, they are the most prominent manufacturers of the Alcubierre Drives, even though the other mega-corporations mostly invented the underlying technologies that made the warp drives possible.