Grain futures trended lower as U.S. ending stocks and regional weather patterns influenced market movement. Soybean futures faced pressure from a 20% increase in five year average ending stocks and increased rainfall in Brazil. Corn futures softened as extreme cold temperatures hindered grain movement, despite strong fundamental demand and increased long positions from money managers. Wheat futures declined as weekly export shipments fell below the levels required to meet U.S.D.A. estimates, though prices showed signs of support near recent lows. Open interest in options for Corn futures remained high with significant activity at the 450 strike.