It is US American
Sauce: https://en.m.wikipedia.org/wiki/Kingston_Technology
Additional info:
Kingston is #1 with 34% market share (nothing new, just put it here for context reasons)
Adata (#2 with 11%), Gigabyte (#7 with 2%) & Transcend (#10 with 1%) are Taiwanese. I assume they are going to set sail for the West as soon as Taiwan gets reincorporated
Lexar (#3 with 11%) is US American owned by a Chinese parent company
Kimtigo (#4 with 9%), Biwin (#5 with 7%) & Colorful (#6 with 5%) are from the PRC
Teclast (#8 with 2%) is likely Chinese, don't have solid evidence tho
PNY (#9 with 1%) is US American
That makes 35% for the US, 14% for Taiwan and 34% for the PRC (if you count Lexar as Chinese - idk how much they are still linked to the US tho)
Ngl I did too at first. But I was sceptical because Kingston sounds like a British bourgeois suburb rather than a chinese company (and upon my research I found out that both of my prejudice claims turned out to be true since Kingston upon Thames is literally a Royal London district where "some Saxon kings were crowned" - Wikipedia 💀). I didn't think it was impossible, but rather unlikely.