Retail farm-supply and grain-marketing cooperative GROWMARK can mark its growth by the grain. A member-owed agricultural co-op, GROWMARK serves farmers in the midwestern US and Ontario, Canada. Founded in 1980, it has more than 250,000 members. Under the FAST STOP name, the co-op runs more than 300 fuel stations and convenience stores in the Midwest. Its Seedway subsidiary sells commercial vegetable seed and farm seed for turf, and grains including alfalfa, corn, wheat, and soybeans. GROWMARK also offers fertilizer, seeds, ethanol, biodiesel, and farm financing. Its MID-CO COMMODITIES subsidiary trades grain and offers advice regarding futures and options.