## 1 Introduction  
Digital transformation has been a phenomenon observed in industrial companies for many years to streamline business processes and support the operations of employees at different levels of the organization. Digital transformation, in its first implementation phase, was identified primarily with the transformation of documents available on paper to electronic versions [1]. However, current trends associated with digital transformation refer to the various sociological and technical changes accompanying the implementation of digital technologies in aspects of social life and industrial activity [2]. These changes are primarily based on developing information technologies that streamline the processes involved in collecting, processing, and distributing information from various sources so that decision-makers have access to comprehensive knowledge that facilitates their process planning and efficient use of resources [3]. Digital transformation is a critical trend for improving logistics processes and developing systems to support these processes. This is primarily due to the increasing popularity of the Industry 4.0 concept and the demands placed on managing global supply chains. To achieve the expected effects of Industry 4.0 in manufacturing processes, it is also necessary to implement digital changes in logistical processes, which handle material flows in a company. Therefore, the digitalization and automation of manufacturing processes as part of implementing Industry 4.0 solutions necessitates the advancement of digital transformation, as well as logistics processes. Achieving ever-higher levels of digital maturity is also a result of participation in global supply chains and the need to obtain up-to-date information (ideally in real time) from cooperating counterparties to improve planning processes. Digital platforms are being developed for supply chain collaboration, bringing together knowledge from various sources and delivering it to partners through the results of multiple analyses that maximize the value of the established partnership [4]. At the same time, many authors emphasize in their research that digital transformation positively influences the integration of sustainable supply chains (e.g., [5,6]). Supply chain co-working creates particular needs for inter-organizational information exchange and data integration. Digitization enables vertical integration (from supply to consumer) and horizontal integration (with other business partners and competitors) to achieve end-to-end visibility [7]. Uninterrupted communication and a shared knowledge base increase trust between partners, fostering closer collaborative business relationships. The COVID-19 pandemic has accelerated digital transformation processes in organizations in all areas by 3-4 years [8]. At the same time, the continuous development of IT technologies and Industry 4.0 solutions means that the potential to implement further improvements at the level of organizations and logistics processes is growing. Therefore, an important research issue is to assess the current level of digital maturity of logistics processes in companies and identify directions for further improvement. The aim of this article is to present the results of a study assessing the digital maturity of logistics processes in a group of selected enterprises located in Poland. The research was conducted among enterprises that are business partners of the Poznan School of Logistics. The main contributions of the presented results should be considered:  
* Identification of the level of digital maturity of logistics processes in performance measurement and process support. * Cross-analysis of the level of digital maturity of logistics processes, reflecting the diversified level of digital transformation in different types and sizes of companies. * Identification of the leading areas of digital transformation in the audited companies and identification of the constraints they face related to the implemented Industry 4.0 solutions.