Millennials represent the future generation of our workforce, as well as our future thought leaders, decision-makers, entrepreneurs, and business owners. The purpose of this study was to identify the cultural attributes of and retention strategies used at companies founded and run by Millennials. This qualitative study collected data through interviews with 10 Millennial managers and 11 Millennial employees. Examination of the data led to the identification of artifacts, behaviors, values, implicit assumptions, and characteristics of these companies. Six common retention strategies also were identified. The concepts underlying these attributes and strategies include openness, egalitarianism and autonomy, immediacy, collaboration and connectedness, and making a valuable impact. Organizations are advised to incorporate these principles into their design, instill supporting structures that help Millennials enhance their potential for contribution, and educate managers about Millennials' preferences and needs. More research is needed to help confirm and extend the present study's findings.