This paper presents a framework for differentiating between foreign acquisitions of companies that might plausibly pose a national security threat to the home country of the target acquisition and those that do not. 1 This framework originally derives from the experience of the United States. The framework is then shown to be relevant and useful for foreign acquisitions in Canada and Australia. In each case, Chinese acquisitions of US, Canadian, or Australian firms are highlighted. The paper concludes by arguing that this framework can serve as an effective non-discriminatory basis for separating genuine from implausible national security threats from foreign acquisitions across OECD states, to include all countries around the world.