If you are so interested in finding out who owns the shares, why dont you ask the company's share registry for the list. They arent hard to get, they must be made available.
A substantial shareholder notice is only required if you hold more than 5 percent. A person with 8 percent who sells only has to lodge a notices for the first 3 percent (unless they are disposed in one transaction). Once they are below 5 percent, they dont have to lodge notices. And if those disposals are to people who dont get over 5 percent, the buyer doesnt have to lodge either.
The company must know who holds the shares according to the register - it might be a nominee, but they must know.
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