In June 2023, the second edition of the commentary on the Market Abuse Regulation (MAR) edited by Lars Klöhn was published by C.H.BECK Verlag.
This volume provides a comprehensive commentary on the Market Abuse Regulation, in particular on ad hoc publicity, the prohibition of insider dealing and market manipulation, the obligation to keep insider lists, and the publicity of directors' dealings.
I myself have contributed with commentaries on Art. 12, 13 and 15 together with the preface (market manipulation) and Art. 20 (investment recommendations).
You can find further information here.