Equity securities available on major U.S. exchanges and priced over $1 are generally available on the platform.
Non-U.S. companies may offer American Depository Receipts (ADRs) for U.S. markets which represent shares of a non-U.S. company.
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https://support.sofi.com/hc/en-us/articles/360046062631-What-is-an-American-Depository-Receipt-ADR-