Sionis Investments is an Investment company owned by Richard Sionis.
Candidates were forced by Richard Sionis to duel physically for vacant positions within the company, with their gladiatorial exploits being watched and wagered on by their colleagues. As a result, most members of staff were at some point walking wounded. Following Richard Sionis' incarceration and later death, the fate of Sionis Investments is unknown.
- "The Mask"
- Although an original creation for the series, Sionis Investments shares a similar name to a corporation from the comics known as Sionis Industries.