The company has stockpiled large quantities of raw materials in the warehouse to prepare for price increases.

stockpiled 是动词 stockpile 的过去分词形式。stock 意思是"库存、储备"，pile 意思是"堆叠、堆积"。stockpile 合起来表示"大量储备、囤积"，通常指为应对未来需求或价格上涨而进行的物资储备。