Short Position

A short position is an open obligation, not a completed trade. Until the borrowed shares are bought back and returned, the seller owes stock to the lender and carries the full exposure to any price move. The position is measured in shares — the count of borrowed shares sold and not yet repurchased — and converted to a percentage of shares on issue to make it comparable across companies of different sizes.

What ASIC publishes is a net figure. Under Regulatory Guide 196 a reporting entity offsets the long holdings it controls in the same security against its short sales, and reports only the residual directional exposure. A desk that is short 5 million shares and long 3 million reports 2 million. This is why the Australian figures are usually lower than gross short sale volume for the same stock, and why a large day of short selling does not necessarily lift the reported position at all.

Reporting is triggered when a participant's net short position exceeds $100,000 or 0.01% of issued capital, whichever is smaller, measured at the end of each trading day. ASIC then aggregates every participant's report into one number per security and publishes it four trading days later. Individual positions are never disclosed, so the data shows how much stock is short but not who holds it.

A position closes in one of three ways. The seller buys the shares back on market and returns them, which is short covering. The lender recalls the stock and the borrower is forced to source replacement shares or close out. Or a corporate action removes the security altogether — a takeover completing, for example, which is why short positions in a target can fall away sharply near a scheme meeting.

Reading a single day's position tells you little on its own. The useful comparisons are the trend in that stock over weeks and months, the position relative to average daily volume, and the position relative to sector peers facing the same conditions.