A stock throughput policy (STP) is a marine policy that insures a company’s inventory and the flow of goods from the source of production to its final destination, whether at a place of storage or a retail store. The goods are covered at all times, whether in transit, undergoing process (although damage caused by the manufacturing process is excluded), or in storage at owned or third-party premises. The policy covers all moveable goods (including inventory), raw materials, semi-finished, and finished products.