- IKOS Systems, Inc.
- Imagination Technologies
- Imec
- iMODL
- Imperas Inc.
- Impinj
- impinj NVM IP
- IMS
- In-Chip Systems
- INCASES Engineering GmbH
- Incentia Design Systems
- Independent Design Automation Companies
- Infineon Technologies
- Infiniscale
- Infinite Designs Ltd.
- Ingenuus Corporation
- Ingot Systems
- InnoLogic Systems, Inc.
- Innotech Corporation
- Innovative CAD Software, Inc.
- Innoveda, Inc.
- INRIA
- inSilicon Corporation
- InSpec Validation System
- Instigate CJSC
- Integrand Software
- Integrated Measurements Systems, Inc.
- Integrated Silicon Systems, Inc.
- Integrated Systems Engineering AG
- Integrity Engineering, Inc.
- Intel Corp.
- Intel PLD business
- Intelligent Systems Japan, KK
- Intento Design
- Interconnectix Inc.
- Interfaces Technical Committee
- Intergraph Electronics
- Intergraph Inc.
- interHDL
- Intermetrics
- Intermetrics VHDL simulator
- International Organization of Standards
- Interra IT
- InTime Software
- Invarian, Inc.
- Invarium, Inc.
- Inventra
- Inventure Inc.
- Invionics Inc.
- IOTA Technology Inc.
