Group
- Hobsclaw Five1
- House BearHeart1
- Howster Press1
- Hyper RPG1
- IFGS1
- IGN Entertainment1
- IGN/Geek & Sundry1
- IMPACT Books1
- ION Inventory1
- IUPUI: Library and Information Science Department1
- IV Studio1
- Ideology of Madness1
- Idiot Savant Productions1
- Idle Champions1
- Iello1
- Imagination1
- Imminent Entertainment1
- ImminentEntertainment1
- Impact Games1
- Improved Initiative1