welcome to the world of xb, page-7

Check out this link http://www.asx.com.au/research/announcements/status_notes.htm

Definition as follows:

XB = ex bonus issue
XB displays for a security from the morning of the Ex Bonus date (generally four business days before the record date) and remains until the close of trading on the bonus issue date. Trading in a security displaying XB on ITS does not carry the right to receive the bonus issue. For more information refer to the description of Cum Bonus. All orders are purged at the end of the trading day prior to the security being quoted on an XB basis.