This paper asks if the sociability of work contributes to gendered labor market inequalities. Socializing with coworkers is a way to cultivate social capital and is an increasingly prominent aspect of corporate culture. Access to social interactions thus provides access to organizational resources and is a potential mechanism of social closure in workplaces. Dominant groups, such as men in male-dominated workplaces, can limit access to social interactions by controlling the timing, context, and content of social interactions to exclude subordinate groups. This study combines data from the American Time Use Survey and National Longitudinal Survey of Youth, 1979, to test the role of sociability in explaining gender inequalities in job tenure, promotions, and earnings. In all three cases, sociability is associated with greater gender inequalities when men predominate in workplaces. In male-dominated jobs, women's earnings fall $3,700 across observed values of sociability, while men's earnings increase by $2,100 Worker-level activity patterns confirm that while women are more sociable than men in non-work contexts, in male-dominated workplaces, women socialize with their coworkers far less frequently than their male colleagues.