The impact investing landscape is changing as new actors, such as global corporations and corporate foundations, develop strategies to pursue social and environmental objectives. In response, the Global Impact Investing Network (GIIN) interviewed companies and corporate foundations to understand their approaches and support the GIIN’s field-building in this critical space. The GIIN then published a position paper in September 2023 and the following case studies in November 2023. These materials highlight the impact investing practices and strategies companies use to pursue sustainability objectives.