One common expectation of school choice policies is that they will generate competition between schools. Despite the large body of work examining whether competition improves student outcomes, we know less about how competition works in the educational sector. We know even less about how charter school leaders perceive and respond to competitive pressures. Using original survey data from the state of Arizona and a multivariate regression framework, we examine which factors predict the competitive relationships between schools and the strategies school leaders report adopting in response to competitive pressures. Our findings inform policy discussions, problems of practice, and provide the impetus for future scholarly work.