For individuals, "US person" means a US citizen or resident, or a person who meets the "substantial presence test" under IRS regulations (see https://www.irs.gov/individuals/international-taxpayers/substantial-presence-test ).

For institutions, "US person" under SEC Reg S (17 CFR Sec. 230.902(k)) means any of:

• Any partnership or corporation organized or incorporated under the laws of the United States;
• Any estate of which any executor or administrator is a U.S. person;
• Any trust of which any trustee is a U.S. person; Any agency or branch of a foreign entity located in the United States;
• Any non-discretionary account or similar account (other than an estate or trust) held by a dealer or other fiduciary for the benefit or account of a U.S. person;
• Any discretionary account or similar account (other than an estate or trust) held by a dealer or other fiduciary organized, incorporated, or (if an individual) resident in the United States; and
• Any partnership or corporation if:
  • (A) Organized or incorporated under the laws of any foreign jurisdiction; and
  • (B) Formed by a U.S. person principally for the purpose of investing in securities not registered under the Act, unless it is organized or incorporated, and owned, by accredited investors (as defined in § 230.501(a)) who are not natural persons, estates or trusts.