Genuine Parts Company v. Cepec,  No. 528, 2015 (April 18, 2016)

Under Delaware law, an entity doing any business in Delaware must register to do so and thereby appoint a registered agent to receive process. For years this was held to confer general jurisdiction over that entity, even for claims that did not arise out of the business it did in Delaware. This decision reverses that old law and confines jurisdiction over non-Delaware entities to claims that arise out of what they have done in Delaware. Of course, there are still exceptions to that general rule, such as when an entity expressly agrees to jurisdiction in Delaware.