| AgReliant Genetics | breeder, producer | 2000 | Corn |
| Baker Creek Heirloom Seed Co. | retailer | 1998 | Tomato, Watermelon, Melon, Cucumber |
| Ball Horticultural / PanAmerican Seed | breeder, distributor | 1905 | Tomato |
| Bayer Crop Science | breeder, producer | - | Corn, Tomato, Watermelon, Cucumber |
| Beck's Hybrids | breeder, producer, distributor | 1937 | Corn, Wheat |
| Corteva Agriscience | breeder, producer | 2019 | Corn, Wheat |
| Harris Seeds | distributor | 1879 | Tomato |
| High Mowing Organic Seeds | breeder, retailer | 1996 | Tomato, Cucumber |
| Johnny's Selected Seeds | breeder, retailer | 1973 | Tomato, Cucumber, Melon |
| Limagrain / Vilmorin-Mikado & HM.CLAUSE | breeder, producer | - | Tomato, Melon |
| Park Seed | retailer | 1868 | Tomato |
| Seed Savers Exchange | association, retailer | 1975 | Tomato |
| Stokes Seeds | distributor | 1881 | Tomato, Cucumber, Melon |
| Syngenta Vegetable Seeds | breeder, producer | - | Tomato, Corn, Watermelon, Melon |
| Territorial Seed Company | retailer | 1979 | Tomato |
| Tomato Growers Supply Company | retailer | - | Tomato |
| Victory Seed Company | retailer, breeder | - | Tomato |
| W. Atlee Burpee & Co. | breeder, retailer | 1876 | Tomato, Cucumber, Watermelon |
| Wyffels Hybrids | breeder, producer | 1946 | Corn |