https://www.nbim.no/contentassets/d3a372eb9d234e57a07caaf0f3...
Updated: 1.3%
Edit: Oops, I misunderstood a question. Actually further in PDF they specify that US specifically is 39%, which is roughly 400 billion. If we go by this number of total capitalization of the US stocks being 30 trillion, then Norwegian oil fund owns 0.4/30 which is 1.3%