- Design Acceleration Inc.
- DesignAdvance Systems Inc.
- DesignPRO Inc.
- Détente Technology, Inc.
- Diablo Research Co. LLC
- Digital Blocks
- Dini Group
- Docea Power
- Dolphin Integration
- Dorado Design Automation, Inc.
- Doulos
- dQdt, Inc.
- DR YIELD
- DRC:DA
- DSM Technologies Inc.
- DSP Division of Philips Semiconductor
- Duolog Technologies Ltd.
- DXCorr Design, Inc.
- Dynamic Soft analysis Inc.
- E-Z-CAD, Inc.
- Eagle Design Automation
- Eagleware, Inc.
- Eagleware-Elanix
- eASIC Corporation
- eBeam Initiative
- eBizAutomation Inc.
- ECAD Inc.
- École Polytechnique de Montréal
- ECSI
- EDA Systems
- EDAC
- EdXact SA
- EEsof, Inc.
- efabless.com
- Elanix, Inc.
- Electronic System Design Alliance
- Eliyan
- Elliptic Technologies
- Elsip AB
- EMA Design Automation
- Embedded Alley Solutions
- Embedded Performance Inc.
- Embedded Solutions Limited
- Embedded Vision Alliance
- Emulation and Verification Engineering
- Emulation division of Mitsui Bussan
- EnSilica Ltd.
- Entasys Design Inc.
- EPIC Design Technology, Inc.
- Escalade Corp.
