Swell portfolios are structured as a combination of equity securities (stocks) that are reflective of the things that you care about. In addition to the securities of US companies listed on an US exchange, Swell also invests in American Depositary Receipts (ADRs).
An ADR is a stock that trades in the US but represents a specified number of shares in a foreign corporation. ADRs are bought and sold on American markets just like regular stocks, and are issued/sponsored in the US by a bank or brokerage firm. ADRs are an easy and cost effective way to buy shares in a foreign company. They save money by reducing administration costs and avoiding foreign taxes on each transaction.