A company can appear in a home-market share listing and in a US quotation through an American depositary receipt, or ADR. Comparing the two prices without reading the ratio can produce a false impression of a bargain. One receipt does not necessarily represent one ordinary share.
The SEC’s investor bulletin on ADRs explains that a receipt may represent a fraction of a share, one share, or multiple shares. The programme’s documents identify the arrangement; the ticker alone does not.
Put the quantities on the same basis
Suppose a fictional ADR represents two ordinary shares. A meaningful price comparison begins with two shares in the home market, then considers the exchange rate and relevant costs. Comparing the ADR directly with one share leaves out half of the underlying quantity.
Even after that adjustment, quotations may come from different trading hours or have different liquidity and spreads. A visible difference is not automatically an executable opportunity. This example explains the comparison, not an investment strategy.
Read beyond the headline price
Check depositary fees, dividend handling, and other programme terms. The SEC bulletin discusses custody fees and directs investors to relevant filings and depositary information. Ask the broker how applicable charges appear in the account rather than assuming they are included in the quoted trading commission.
Also identify the underlying company and the reporting information available for it. Buying a familiar-looking US ticker does not remove the business, currency, political, or market risks connected with the foreign company.
Keep a research note containing the exact security, ratio, source document, and date checked. If the programme changes, an old comparison may no longer be valid. Understanding the unit you are comparing is a first step in research, not a conclusion that the security is suitable for your finances.