What is interesting with the recent AEC , substantial holder...

What is interesting with the recent AEC , substantial holder announcement is up until the 28/9 they were sitting just marginally under the substantial holder reporting threshold , the additional purchase on the 28/9 put them dot on the 5% disclosure threshold,which many large holders prefer to siit under for buy//sell non disclosure purposes.
So perhaps this was a strategic move with the anticipation of new and important data due.Did they want the ability to have there thoughts on this upcoming data and what might subsequently follow , potential for collaboratins or T/O may be possibilities if the data is favourable. As I believe now , becoming a substantial holder gives the company some entitlement such as being able to call a general meeting with Immutep
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“Members holding 5%It is a requirement that members either calling the meeting or requesting the directors call the meeting hold at least 5% of the issued share capital in the company. The percentage of votes that members have is to be worked out as at the midnight before the request is given to the company”