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| Custom Microwave Components | Cutlass Fasteners | Cvilux |
| CW Industries | CWC Instruments | Cyberbond |
| Cybernetic Micro Systems | CyberOptics Semiconductor | Cynergy3 |
| Cypress Semiconductor | Cyrix | Cytec Industries |
| CZ Labs | D&B Industrial Grp/Rowe Inds | D&R Associates |
| D-Cemco | D-Link | D.A.E.C. |
| Da-Lite Screen Co. | Daburn Electronics & Cable | Daewoo Electric Components |
| Daido | Dainolite | Daisy Data |
| Daito | Dake Battery | Dalbani |
| Dalco | Dale Electronics 1/Vishay | Dale Electronics 2/Vishay |
| Dallas Semiconductor/Maxim | DALSA | Damac Products |
| Danaher Industrial Controls | Danaher Motion-IDC | Danaher Tool Group |
| Danfoss Drives Div. Danfoss Inc | Danfoss Industrial Controls Div. | Daniels Mfg. |
| Dantona Industries | Dart Controls | Dasytec |
| Data Delay Devices | Data Display Products | Data Guide Cable |
| Data Image | Data International of North America | Data Modules |
| Data Track Tech | Data Translation | Data-Linc Group |
| DataCon | Dataforth | Datak |
| Datalogic | Datamax | Dataram |
| dataTaker | Datatran | Datatronics |
| Daveco | David Clark Co. | Davies Molding L.L.C. |
| Davis Co. J.W. | Davis Inotek Instruments | Dayco Products |
| Dazor Mfg. |
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