If a foreign company wants to trade in the US they can be listed outside the US (then they have a 'F' at the end of the ticker)or in the US. The adress on NVSOS is most likely a POBOX, so they can be listed as a US company. But the company itself stays in this case Turkish, because there is the headquarter. The pay taxes in Turkey, not in the US. And they fall under Turkish law.
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