From the Tamron YouTube channel:
Tamron is a global manufacturer of optical equipment that offers premium-quality products, Interchangeable lenses for 35mm / Digital SLR camera, Interchangeable lenses for Non-Reflex type camera, Surveillance camera lenses, FA and Machine vision lenses, Camcorder lenses, and Drone lenses and others for many different industries.
B&H carries Tamron lenses.