Fortune rank: No. 750 on revenue of $3.5 billion; up 16 spots from last year.
History: In 1946, Robert B. Daugherty spent nearly his life’s savings — $5,000 — to buy a small manufacturing company on a farm near Valley to build farm elevators. Years later, with the invention of center-pivot irrigation, Valmont found its niche. It then expanded into steel pipe and tubing manufacturing for irrigation systems and other industries. Through acquisitions and new construction, the company grew to be a global player in certain segments of the agriculture, communications and utilities markets. Today, Valmont’s worldwide operations are constantly looking for opportunities to expand its four business sectors: engineered support structures (steel and aluminum poles for traffic lights, street lighting, etc.); utility support structures (poles for electrical transmission lines, etc.); irrigation; and coatings (galvanization).