Starting from this list of Davos attendees, I've attempted to quickly classify the 711 "USA" individuals by racial or ethnic ancestry.
This is a very rough draft, but the initial breakdown I come up with is [29 Jan: made a few changes (see comments); updated percentages shown in brackets]:
[46.41%] 46.69% Northwestern European
[27.29%] 27.43% Jewish
6.05% Southern European
5.49% South Asian
[4.08%] 3.80% Middle Eastern
3.38% Latin America / Brazil
3.23% East Asian
2.25% Eastern European
[0.28%] 0.14% North American Indian
Corrections are welcome. I've again defaulted to putting people in the NW European category. There may be a few false positives in the Jewish category, but there are probably more false negatives.
Full list below.