It is issued weekly by the Irish Recorded Music Association (IRMA) and complied on its behalf by GfK's Chart-Track until losing the contract at the end of 2016.
[2] A new chart is compiled and released to the public by IRMA each Friday at 15:00 GMT.
[2] Each chart is dated with the "week-ending" database of the previous Thursday.
Midweek versions of the chart are produced every day, allowing record companies and retailers to track sales trends.
[3] However, Chart-Track's online archive only documents the top ten albums from each particular week.