Allow Stephens MFG to supply your successful business building blocks. Concrete Industry Segments Ready Mix Precast Central Mix RCC Environmental Material Handling The Stephens Process Bill Stephens began Stephens Manufacturing in 1957. To keep with the hillbilly image, legends have it that Bill made his first silo by bending steel around a big oak tree. Yet, today Stephens Manufacturing is one of the largest global manufacturers of concrete plants in the world, shipping plants all over the United States, Canada, Mexico, South America, the Caribbean and even parts of Africa. Learn More About Stephens Manufacturing Stephens equipment is designed and fabricated to meet specific seismic requirements for the location the equipment will be erected in.