Online teacherpreneurship occurs when current or former P-12 teachers distribute their original classroom resources and ideas through online educational marketplaces such as TeachersPayTeachers.com (TpT). Online teacherpreneurs' materials have become prolific in classrooms, but little is known about these individuals or their practice. This study sought to understand the characteristics, school environments, practices, and impacts of teacherpreneurship through a survey of TpT sellers (n = 412). Descriptive results show that online teacherpreneurs were predominantly female, white, highly educated, and experienced practitioners. They viewed themselves as helpful, hard-working, creative, and organized. Most separated their school and business work, and they spent considerable time creating educational resources, collaborating with teachers online, and building their business. Online teacherpreneurs reported experiencing improvements to their teaching practice and teacher leadership opportunities.