Interesting graph, but I have some questions regarding OP's title of registered company. For example, Pegatron and Foxconn are companies headquartered in Taiwan, but the source doesn't list headquarters location but only lists multiple "primary manufacturing locations" for each company such mainland China, Japan, Brazil, etc. Does this then mean that a single company are counted in multiple countries? Or are only the country of the headquarters counted? Or the country of where they are registered?

Thanks for sharing the graph and especially the source, which is fascinating.