Praxis was a very successful private corporation founded by William Fort on Earth. It was co-managed by Fort's close associates, the so-called Eighteen Immortals. It was a transnational and a metanational. It successfully survived the Great Flood by investing heavily in infrastructure reconstruction.
- Dumpmines: resources recovery, Terra. Originally founded by Art Randolph.
- Ouroboros: resources recovery, Mars.
- Biotique: biotechnologies, Mars. Sax Russell worked there, undercover as Stephen Lindholm