The present study sought to expand the literature on the relations of major dimensions of personality with integrative negotiation outcomes by introducing the HEXACO model, investigating both effects of the negotiators' and their counterparts' personality traits on objective and subjective negotiation outcomes, and investigating two interactions between the negotiators' and counterparts' personalities. One hundred forty-eight participants completed the HEXACO-100 measure of personality. Participants then engaged in a dyadic negotiation task that contained a mix of distributive and integrative elements (74 dyads). Measures of subjective experience and objective economic value were obtained, and actor–partner interdependence models were estimated. Personality was generally a better predictor of subjective experience than objective economic value. In particular, partner honesty-humility, extraversion, and openness predicted more positive negotiation experiences. An actor–partner interaction effect was found for actor-agreeableness by partner-honesty-humility on economic outcomes; agreeable actors achieved worse (better) economic outcomes when negotiating with partners that were low (high) on honesty-humility.