This directory contains information on companies producing carbon nanotubes or applying carbon nanotubes to products.
| Nanotube Company | Products |
| Bayer Material Science | Carbon nanotubes |
| Carbon Nanotubes Plus | Carbon nanotubes |
| Catalytic Materials | Carbon nanotubes and graphite nanofibers |
| CVD Materials | Carbon nanotubes and graphene |
| Emfutur Technologies | Carbon nanotubes |
| Glonatech | Carbon nanotubes |
| Hyperion | Nanotube based plastic mold compounds |
| MilliporeSigma | Carbon nanotubes |
| NanoAmor | Carbon nanotubes, carbon nanofibers, nanowires and nanoparticles |
| Nanocomp Technologies | Carbon nanotube sheets, tapes and yarns |
| Nanocyl | Nanotube based epoxy resins |
| Nanocs | Functionalizied nanotubes |
| NanoIntegris | Nanotubes and semiconducting inks |
| Nano Lab | Functionalizied nanotubes and nanotube arrays |
| Nanomix | Carbon nanotube based sensors for detecting chemical vapors. |
| NaturalNano | Nanotubes composed of halloysite |
| Nanoshel | Carbon nanotubes, metal and oxide nanoparticles |
| OCSiAl | Single Walled Carbon nanotubes |
| Rosseter Holdings | Carbon nanotubes |
| SkySpring Nanomaterials | Carbon nanotubes and nanopowders |
| SouthWest NanoTechnologies | Carbon nanotubes |
| Unidym | Nanotube based transparent conductive film for use in applications such as LCD displays and e-paper |
| Xintek | Nanotube based cathodes, AFM probes and x-ray tubes |
| Zyvex Preformance Materials | Epoxy resins strengthened with carbon nanotubes |
| ZinRay Systems | Nanotube based X-ray systems |
| Redex | Carbon nanotubes |