| SpectronRx | Indiana |
| Spectros Medical Devices, Inc. | Texas |
| Spectrotel, Inc. | New Jersey |
| Spectrum | Missouri |
| Spectrum Advanced Manufacturing Technologies, Inc. | Colorado |
| Spectrum AI, Inc. | California |
| Spectrum Assembly, Inc. | California |
| Spectrum Automation | Michigan |
| Spectrum Billing Technologies, LLC | Michigan |
| Spectrum CNC Technologies | California |
| Spectrum Control | Pennsylvania |
| Spectrum Controls, Inc. | Washington |
| Spectrum Corporation | Texas |
| Spectrum Data Services | California |
| Spectrum Labs | California |
| Spectrum Marketing Companies | |
| Spectrum Media Group | Oklahoma |
| Spectrum Media Solutions | |
| Spectrum Process Equipment, Inc. | Pennsylvania |
| Spectrum Research, Inc. | Tennessee |
| Spectrum Semiconductor Materials, Inc. | California |
| Spectrum Software Solutions, Inc. | New York |
| Spectrum Software, Inc. | Georgia |
| Spectrum Unlimited, LLC | California |
| Spectrum Vascular | |
| Spectrum WebWorks | Vermont |
| Spectrum21 | California |
| SpectrumBPO | |
| Spectrumware | |
| SpectrumWatch | Virginia |
| Spectrumwise | North Carolina |
| Spectrus | |
| Spectruss | |
| Specular Theory | California |
| Speculative Product Design, LLC | California |
| SpecView Corporation | Washington |
| Spedsta | California |
| Speece Technologies, Inc. | Pennsylvania |
| Speech Morphing, Inc. | |
| Speech Technology Media | New Jersey |
| SpeechEasy | |
| Speechify, Inc. | |
| SpeechRecognitionSolutions | New Hampshire |
| SpeechRep Media, Inc. | |
| SpeechSoft | New York |
| SpeechVive | Indiana |
| SPEED BioSystems, LLC | Maryland |
| Speed Laboratory, Inc. | |
| Speed of Sound, Inc. | Colorado |
| Speed Ventures, Inc. | California |