Not sure what you're asking, but pretty much all (if not all) financial instruments in Norway are registered at www.vps.no
VPS is owned by Oslo Børs and is a register for both shareholders (I can access and see how many shares I have in norwegian-registered financial instruments) and the companies (the company can access a database of its shareholders).
For SIAF-ME I assume they have been registered with VPS ever since SIAF got listed on Merkur (at least it has been the case ever since my first shares in May 2017)
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