As the German collective bargaining coverage continues to decline, calls for governmental measures to stop this development become stronger. However, social partners’ possibilities to strengthen the collective bargaining system themselves are often ignored. To identify possible actions for employer organisations and trade unions, this paper investigates the satisfaction of covered firms with their sector-level agreement in the German metal and electrical industry. The aim is to gain information on factors influencing the satisfaction of covered firms. Based on this information, the social partners can stabilise or even raise the satisfaction of firms covered by the sector-level agreement and thus support the whole system.