Valuation, page-147

To date since 11 April 2018 there has been 606,324,119 options traded out of the 547,369,372 - 1.1c options on issue. Data thanks to COMMSEC end of price analysis tool... 
Some profit takers from the initial issue but I'd say there are either a few holders building a position or new holders hoping to make a quick buck. Assuming that 50% have been traders by traders for profit that is still 55% options turnover by others...
Can't locate a top 20 option holder listing to see what has been happening but would make for interesting reading when compared against shareholding top 20 to see who is holding and who isn't 
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