Trading venues should publish an aggregated weekly breakdown of the positions held by different categories of persons for the different commodity derivative contracts, emission allowances and derivatives thereof traded on their platforms. A comprehensive and detailed breakdown of the positions held by all persons should be made available to the competent authority at least daily. Arrangement for reporting under this Directive should take into account, where applicable, reporting requirements already imposed under Article 8 of Regulation (EU) No 1227/2011.