This paper documents the translation and adaptation of the "Career Adapt-Abilities Scale + Cooperation Scale" (CAAS + C; Savickas & Porfeli, 2015) to the Brazilian context and provides initial validity evidence for this instrument by testing its internal structure and exploring its relationships with external variables (i.e., Big Five traits, social support, and preference for working in groups). Data were gathered in two Brazilian samples (N = 351 and N = 920, respectively). Regarding the internal structure of the 30-item CAAS + C-Brazilian form, the results provided clear support for the expected five-dimensional solution, including career Concern, Confidence, Curiosity, Confidence, and Cooperation. Further, Cooperation was the adaptability dimension with the strongest correlation with social support, and this dimension demonstrated weaker correlations with the Big Five factors when compared to the other adaptability dimensions. Finally, Cooperation was identified as the only adaptability dimension significantly related to the preference for working in groups. The results of this study provide support for the structural and criterion validity of the CAAS + C scale in a Brazilian context.