What is less well known is that most of these large STEM courses also exhibit significant gendered performance differences: male students experience smaller grade penalties than female students. Many of these differences are substantial, as large as -0.28 and averaging -0.11 letter grades. Even after optimal matching the average GPD across all STEM courses is still -0.10. While gendered performance differences are much less pronounced in the Humanities and Social Sciences, first and second semester Economics courses cluster with the STEM lectures.