Glossary term
American Depositary Share
An American depositary share is a U.S.-traded security representing an ownership interest in shares of a non-U.S. company held by a depositary bank.
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What Is an American Depositary Share?
An American depositary share, or ADS, is a U.S.-traded security representing an ownership interest in shares of a non-U.S. company held by a depositary bank. ADSs are the underlying shares represented by American depositary receipts, or ADRs, which trade in U.S. markets.
The terms ADS and ADR are often used casually together, but they are not identical. The ADR is the negotiable certificate or receipt. The ADS is the share interest the ADR represents.
Key Takeaways
- An ADS represents shares of a foreign company held through a U.S. depositary structure.
- ADRs are receipts that evidence ownership of ADSs.
- One ADS may represent one foreign share, multiple shares, or a fraction of a share.
- ADSs make some foreign stocks easier for U.S. investors to trade and settle.
- Investors still face foreign-company, currency, disclosure, tax, and political risks.
How ADSs Work
A depositary bank works with a non-U.S. company or market participants to hold the company's ordinary shares and issue ADSs in the United States. Those ADSs can then trade through ADR programs, often in U.S. dollars and through U.S. brokerage accounts.
The ratio matters. One ADS might equal one ordinary share, two ordinary shares, or a fraction of a share. That ratio affects price comparisons between the U.S.-traded ADS and the foreign ordinary shares.
Why Companies and Investors Use Them
Foreign companies may use depositary share programs to reach U.S. investors, broaden liquidity, and make their shares easier to access. U.S. investors may use ADSs to gain international exposure without directly opening foreign brokerage accounts or trading in foreign settlement systems.
The convenience does not remove risk. The company may report under different accounting standards, operate under different governance norms, and be affected by exchange rates, withholding taxes, sanctions, capital controls, or political developments.
ADS Versus Ordinary Foreign Shares
Security | Where it trades | Main distinction |
|---|---|---|
ADS/ADR | U.S. market or OTC market | U.S. depositary structure represents foreign shares. |
Ordinary share | Home-country or foreign market | Direct local-market share of the company. |
Prices should be economically related after adjusting for the ADS ratio and currency exchange rate, but market frictions, fees, liquidity, and timing can create differences.
What Investors Should Inspect
Read the ADR program materials, deposit agreement, fees, ratio, level of listing, reporting obligations, voting mechanics, dividend conversion process, and tax treatment. Sponsored ADRs generally involve the foreign company directly, while unsponsored ADRs may have less company involvement.
The practical question is whether the ADS gives the investor the exposure they expect and whether the added structure introduces costs or limits that matter.
The Bottom Line
An American depositary share gives U.S. investors a way to own an interest in a non-U.S. company through a U.S. depositary structure. It can simplify access, but it does not turn a foreign-stock investment into a domestic one.