T+4 Delay

The delay is a consequence of how the reports are assembled, not an arbitrary embargo. Each reporting entity calculates its net short position as at the close of trading, lodges it with ASIC by the deadline set out in Regulatory Guide 196, and ASIC then aggregates every lodgement for every security before publishing a single figure per stock. The four trading day gap allows for lodgement, aggregation and correction of late or amended reports.

Trading days, not calendar days, drive the schedule. A position dated Monday appears on Friday. A position dated Thursday appears on the following Wednesday. Public holidays push the sequence further out, and the ASX and national holiday calendars mean the gap can stretch to more than a week of wall-clock time around Easter and Christmas.

The practical consequence is that every short interest figure is historical. During a fast-moving event — a downgrade, an equity raising, a takeover bid — the published position describes the market before the news. Positions can be opened and closed entirely inside the window and never appear as a peak in the published series. Anyone using the data to infer what short sellers are doing right now is reading a four-day-old photograph.

This delay also explains why the data works better as a trend than a signal. Consecutive reports showing a position building over weeks are meaningful, because the direction survives the lag. A single elevated print is not, because the position behind it may already have been covered. The same applies in reverse: a sharp fall in reported short interest often reflects covering that finished days before it became visible.

The delay is unrelated to settlement. T+2 settlement is the two business day cycle for delivering shares and cash after a trade; the T+4 short position delay is a disclosure timetable. The two are frequently conflated but govern entirely different obligations.

Note also that this delay applies to reported net positions, not to short sale transactions. Gross short sale volumes reported by brokers to the ASX under the transaction reporting obligation are published on a much shorter cycle. They measure trading flow on a given day rather than open positions, so the two series answer different questions and should not be compared as though one were a faster version of the other.