| Innovative Sofia | Sofia |
| Innovator Coworking Space | Sofia |
| Inoreader | Sofia |
| Inoset | Sofia |
| Ins Info Trading | Sofia |
| Inspirit | Sofia |
| Institute for Computer Science, Artificial Intelligence and Technology | Sofia |
| Institute for Security and International Studies | |
| Institute of Information and Communication Technologies - BAS | Sofia |
| Intelligent Systems | Sofia |
| IntelSmart, LLC | Plovdiv |
| Intelsoft | Sofia |
| Interactive Share Ltd | Sofia |
| InterConsult Bulgaria | Sofia |
| International Human Resources | Sofia |
| Internet Corporated Networks LLC | Sofia |
| Internet Society Bulgaria | Sofia |
| Invenio Partners | |
| InvestBulgaria Agency | Sofia |
| Investor.bg | Sofia |
| IPL Consulting | Sofia |
| iRepair | Sofia |
| IRM Ltd | Sofia |
| Isomatic Lab Ltd | Sofia |
| Ispolink Ltd | |
| iSTYLE | Sofia |
| IT Advanced | Plovdiv |
| IT Gix Ltd | Sofia |
| IT Metamorphosis | |
| It St Technology Ltd | |
| IT STEP Computer Academy | Sofia |
| IT Talents | Sofia |
| IT Training Pro, LLC | Sofia |
| ITA Group Bulgaria | Sofia |
| ITBP Ltd | |
| ITC Consult | Sofia |
| ITCE | Sofia |
| Iteco Ltd | Sofia |
| IteraFlow Ltd | |
| ITeventZ.bg | Sofia |
| ITIDO Technologies | Sofia |
| ITNEWS.bg | Sofia |
| iTrack | Sofia |
| ITSolutions | Sofia |
| IvuWorks | Sofia |
| izone.bg | Sofia |
| J&T Services | |
| Jamba | Sofia |
| Java2Days | Sofia |
| JMTechnologies Ltd | Sofia |