A Study to Evaluate Cenvacibart (REGN7508) for Secondary Stroke Prevention in Adult Participants

This study will test an experimental Regeneron drug called cenvacibart (REGN7508) ("study drug") compared with a placebo (a look-alike treatment with no active medicine) on top of background antiplatelet medications. The purpose of this study is to find out if cenvacibart can safely reduce the risk of another ischemic stroke or another blood clot related events in people who have recently had an ischemic stroke or mini-stroke (TIA). The study is looking at: * How well cenvacibart works * What side effects cenvacibart might cause * How much cenvacibart is in the blood at different times * How the body reacts to cenvacibart * How cenvacibart could affect the blood which can help researchers understand why cenvacibart works better in some people than others