Having looked at this in a little more detail, my best guess would be that John Sim and Ms Suttisathiranon have bought the shares previously held by Turnbull Hutton's estate. It'd give them ~20% of the shareholding, and would explain the appointment of both to the board since the turn of the year.
Edit: Hadn't factored in Sim's existing shares held through NRR Investments Ltd. It could just be that he's been appointed to the board based on that alone, but if we speculate that the above may be true, it would give Sim ~37% of the shareholding, more than anyone else, including Mario Caira who currently holds ~29% when you factor in MC Leisure Ltd's shares as well as his own.