We examined key influences on STEM college seniors' postgraduate plans. Using data from the National Longitudinal Study of Freshmen we utilized multilevel modeling to identify variables associated with planning to pursue a STEM-related job or STEM graduate study after graduation. Key findings emphasize the importance of volunteering and extracurricular activities for women, as well as lower-income and underrepresented racially minoritized students, as well as the relevance of interaction with faculty. Findings also suggest that a certain amount of "opportunity hoarding" exists among majority-status students. We conclude with implications for creating more welcoming, inclusive, and diverse STEM environments.