Presented at the 2015 National Symposium on Student Retention (November 4, 2015), this poster illuminates the role that gender and ethnic/racial identities play in the formation of peer networks in STEM for underrepresented students of color, with a special investigation of Computer Science majors. Among its findings: ethnic/racial identities, however not gender identities, are proposed as moderators of the attainment and maintenance of STEM peer support networks; STEM undergraduate majors were significantly more likely to credit peer influence in their persistence in STEM than non-STEM majors.