If evidence points to the equal efficacy of all bona fide treatments for borderline personality disorder (BPD) in general, it may not necessarily be true for a specific individual, nor do such general conclusions help in the triage of clients in clinical services. We investigated potential therapy outcome predictors for participants with a BPD diagnosis (N = 99). They were assessed on scales including the Outcome Questionnaire-45.2 (OQ-45), the Inventory of Interpersonal Problems-64, and the Borderline Symptom List. Our analyses revealed that individuals with low levels of symptom distress at intake had the smallest change in total OQ-45 score over the course of brief treatment, while the individuals with high levels of symptom distress had a mean large change in total score (-23). We observed that individuals with high symptom loads AND low levels of interpersonal problems at intake seemed to have the best progress.