Forget T-bills and mutual funds. Pioneer Hi-Bred International, a subsidiary of chemical giant DuPont, boasts the best yields. One of the world's largest commercial seed producers, Pioneer uses genetic research to develop hybrid seeds designed to increase the quantity, quality, and sustainability of crop yields for farmers. The company produces Pioneer brand corn hybrid and soybean varieties, sunflower, canola, rice, sorghum, and wheat, as well as forage and grain additives. It offers a range of agricutural services, including crop management and agronomy.