Export controls

Export controls are government rules that limit or ban the sale of certain products, technology or know how to other countries. They usually target goods with military or strategic value, such as advanced chips, chipmaking equipment or software, and they can apply to whole countries or to specific companies on a restricted list. Selling a controlled product typically requires a government licence, which can be refused or withdrawn.

For a company, export controls work differently from a tariff. A tariff makes a sale more expensive, while an export control can make it illegal, so revenue from an affected market can shrink or disappear almost overnight. Companies sometimes respond by designing slower versions of a product that fall under the limits, but the rules can be tightened again, and customers in the restricted country may switch to local suppliers for good.

Because the rules are set by governments and can change quickly, export controls are a risk outside management's control. When analyzing a company, check how much of its revenue comes from countries where its products face restrictions, and whether its guidance already assumes that revenue is gone. A company that has already written a market down to zero carries less surprise risk from it than one still counting on it.