This study examined the direct, mediating, and moderating effects of proactive outcomes in the relationship between newcomer proactive behaviors and socialization outcomes. Based on a sample of 204 co-op university students who completed surveys at the end of their work term, the results indicated that newcomers who more frequently engaged in a proactive behavior (e.g., information seeking) were more likely to receive the corresponding proactive outcome (e.g., information). We also found that proactive outcomes mediate the relationship between proactive behaviors and socialization outcomes and several of the proactive behaviors were more strongly related to socialization outcomes for newcomers who obtained more proactive outcomes. These results indicate the important yet previously neglected role of proactive outcomes for understanding the relationship between newcomer proactive socialization behaviors and outcomes. (Contains 4 tables and 1 figure.)