This article explores recent trade union efforts in Ireland to re-engage activists and members and promote revitalization following the termination of a 22-year period of tripartite social partnership. It analyses four case studies of major unions’ strategies to involve activists and members in a workplace-anchored model of firm-level collective bargaining. The findings indicate that decentralized bargaining has become the preferred model of pay determination for Irish unions, and they express little interest in returning to national-level centralized bargaining. Union leaders are enthusiastic about company-level bargaining primarily for three reasons. First, it revitalizes unions by sustaining and expanding union membership at the workplace. Second, it supports local bargaining arrangements that produce tangible benefits for workers, showcasing the effectiveness of unions in advocating for their members. Third, workplace arrangements enhance union influence over management decision-making, both directly through firm-level collective bargaining and indirectly by fostering incentives for continuous dialogue and information exchange.