- Integrify
- Intel
- InterACT English
- Interact English gGmbH
- InterContinental Hotels Group
- International Max Planck Research School for Molecular Life Sciences, Max Planck Society
- International People Solutions
- International Rescue Committee (IRC)
- International School of Düsseldorf
- International School of Stuttgart e.V.
- International schools in Frankfurt am Main
- InterNations
- InternetOne
- Internews
- Intershop
- Intertrust
- Intracon
- InTuition
- Intuitive
- Intuitive Surgical
- Invesco
- IQVIA
- Ironhack
- ISF International School Frankfurt
- ISG
- isi GmbH
- Issuu
- IST
- itelligence a/s
- ITSELECTA
- IVECO
- iVentureGroup
- iwoca
- iZettle
- J.Lindeberg AB
- J.P. Morgan
- Jabra GN
- Jacobs
- Jacobs Douwe Egberts
- Jaguar Land Rover
- Jamf
- Japan Tobacco International (JTI)
- Japan Tobacco International(JTI)
- Jazz Pharmaceuticals
- Jellyfish
- jenoptik
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