RD I don't think that these brokers act as market-makers. Normally they just sell shares electronically on behalf of their clients. This also goes for Merkur. When I buy shares I buy from an investor who has placed an order with a broker. As far as I understand this the broker does not own the shares at any stage. If you were a client of one of the big firms listed in my post you could I guess sell shares short in SIAF in Oslo if it was accepted by that firm (broker) even if you did not own any shares in SIAF. It therefore looks as if there could be substantial naked shorting in SIAF. I may however misunderstood things.
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