On June 17, the Agency for the Cooperation of Energy Regulators (ACER) published a fourth edition of its guidance (Guidance) on the application of the EU regulation on wholesale energy market integrity and transparency (REMIT). In particular, the Guidance focuses on Article 15 of REMIT, which requires persons professionally arranging transactions (PPATs) in wholesale energy products to report transactions they reasonably suspect might breach REMIT prohibitions of insider trading or market manipulation. The Guidance further defines the concept of PPATs, and gives examples of entities that would fall within the parameters of a PPAT. According to the Guidance, energy exchanges, broker platforms/brokers, cross-border capacity exchanges and secondary capacity allocation platforms would likely be considered PPATs.