| 2J Antenna | 2Pai Semiconductor | 3 Y Power Technology |
| 3D Printz | 3L Electronic Corporation | 3M |
| 3M E.A.R | 3peak | 4 Lite |
| 4D Systems |
| QANTEK | Qimonda | Qorvo | |
| QT Brightek | QTQuarztechnik | Quadravox | |
| Qualcomm | Qualtek Electronics Corp. | Quarton, Inc. | |
| Quatech/B+B SmartWorx | Quectel | Quickfilter Technologies |