This paper in the Journal of Sustainable Finance examines the quality of the gender lens investing field’s underlying gender analysis to assess how a field built to redress marginalization analyzes that marginalization. The authors question the validity of the dominant definition of 'gender' used in investing. The authors find that a comprehensive understanding of gender encompasses gender identity and sexuality as well as social, economic, and geopolitical considerations. The authors find a significant gap between gender lens investing primary modes of analysis and lessons from scholars. Acknowledging the challenge of translating theory into financial practice, the authors suggest steps towards an investment practice that better mirrors how gender operates in the world.