This book constitutes the proceedings of the 40th International Conference on Application and Theory of Petri Nets and Concurrency, PETRI NETS 2019, held in Aachen, Germany, , in June 2018. Petri Nets 2019 is co-located with the 19th International Conference on Application of Concurrency to System Design, ACSD 2019.The 23 regular and 3 invited papers presented together in this volume were carefully reviewed and selected from 41 submissions. The focus of the conference is on following topics: Models, Tools, Synthesis, Semantics, Concurrent Processes, Algorithmic Aspects, Parametrics and Combinatorics, and Models with Extensions.

This book constitutes the proceedings of the 40th International Conference on Application and Theory of Petri Nets and Concurrency, PETRI NETS 2019, held in Aachen, Germany, , in June 2018. Petri Nets 2019 is co-located with the 19th International Conference on Application of Concurrency to System Design, ACSD 2019.The 23 regular and 3 invited papers presented together in this volume were carefully reviewed and selected from 41 submissions. The focus of the conference is on following topics: Models, Tools, Synthesis, Semantics, Concurrent Processes, Algorithmic Aspects, Parametrics and Combinatorics, and Models with Extensions.