With the focus of manufacturing companies on the digital transformation, Manufacturing Execution Systemsare market-ready, modular software solutions for manufacturing companies to integrate the value-addingand supporting processes horizontal and vertical in the company. Companies, especially small and mediumsized companies, face high internal and external costs for the implementation of the MES modules. Anadvantage of MES is the possibility to implement the systems in a continually, module-by-module approach,with the benefit of timely distributed investments. By realizing fast improvements, companies can use thebenefits for further module implementations. This paper proposes a maturity model to measure the impactof an MES on the digital transformation of the company’s production systems. The model fulfils twopurposes. The first, companies can measure the impact based on the difference between its current maturityindex and the potential index of an implemented MES. The second is, the user can identify what impact anMES has in general on the digital transformation since the developed maturity model is derived from anestablished industry 4.0 maturity model. The development of the maturity model is based on themethodologies of AKKASOGLU and focuses on the further development of an established model. As anoutlook, the application of the model will be described briefly. The proposed maturity model can directly beused by practitioners and offers implications for further development of MES functionalities.