Thanks so much for this.
Pershing is the back end settlement platform for bigger market participants such as wholesale, institutional and professional investors in trusts for nominees/custody services. When Pershing buys this is an indication of larger fish staking positions.
As SMX' is a ASX listed entity with global exposure, I would infer that a proportion of Pershings buying on market has been for international investors which tend to be long term positions taking free floating shares off market tightening up the share register