On rereading there are actually two Colonial entities that purchased shares. Also I didn't mention Avanteos Investments as they only purchased 22k shares.
What I was highlighting is that CBA equities borrowed a signifcant amount of the shares. I am not sure why one CBA entity would presumably prepare to short while the other went long?
This information is from Annexure B of the announcement.
PBG Price at posting:
80.0¢ Sentiment: None Disclosure: Not Held