Running out of inventory. Bloomberg Financial Dictionary
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the situation of not having particular goods in stock, because they have all been used or sold:
• When stockouts of Christmas trees occurred, the company brought in new supplies, only to be left with a surplus after Christmas.
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stockout UK US /ˈstɒkaʊt/ noun [C] US COMMERCE
► a situation in which particular goods are no longer available for sale: »
When outsourcing led to stockouts, the company was forced to bring its logistics function back in-house.
Financial and business terms. 2012.