(12)Retention of and access to STORs which have been submitted and of the analysis performed on suspicious orders and transactions which did not result in the submission of a STOR forms an important part of the procedures to detect market abuse. The ability to recall and review the analysis performed on STORs which have been submitted, as well as those suspicious orders and transactions which were analysed, but in relation to which it was concluded that the grounds for suspicion were not reasonable, will assist persons professionally executing or arranging transactions and market operators or investment firms operating a trading venue in exercising their judgement when considering subsequent suspicious orders or transactions. The analysis performed on suspicious orders and transactions which did not ultimately lead to a STOR being submitted assists those persons in refining their surveillance systems and in detecting patterns of repeated behaviour, the aggregate of which could, considered as a whole, result in a reasonable suspicion of insider dealing, market manipulation or attempted insider dealing or market manipulation. Furthermore, the above records will also assist in evidencing compliance with the requirements laid down in this Regulation and facilitate the performance by competent authorities of their supervisory, investigatory and enforcement functions under Regulation (EU) No 596/2014.