A journey to the north - 1pg ($1.20-1.50), page-8

Broker data, show UBS Securities bought 430k on 22 June 2016.
But if you compared with the ASX announcement from UBS, UBS sold 238450 shares on 22 June 2016.

The big discrepancy was due to different entities,
- UBS Securities is similar to Comsec Securities, acting as broker for institutional buyers
- UBS sold 238k shares at its own capacity, which they owned/bought/sold shares under their name, not on behalf of their clients.