No single country-of-origin group dominates the U.S. Asian population, but the largest groups are of Chinese, Indian and Filipino origin. As of 2015, 24% of Asian Americans (4.9 million) were of Chinese origin, the largest single origin group. The next two largest origin groups are Indian-origin Asians, who accounted for 20% of the national Asian population (4.0 million), and Filipinos (19%, or 3.9 million). Those with roots in Vietnam, Korea and Japan easily clear the 1 million mark as well. The remaining 13 groups in this analysis account for just 12% of all U.S. Asians.
https://www.pewresearch.org/fact-tank/2017/09/08/key-facts-about-asian-americans/