For most domestic stocks on the Tokyo Stock Exchange (TSE), the standard order is 100 shares, not one share. Japan Exchange Group (JPX), which operates the TSE, calls this the trading unit. So a quote of ¥2,400 normally implies a standard domestic-stock order value of ¥240,000 before brokerage commission, taxes, currency conversion and any other broker charges.
That does not mean every Japan-related instrument has a 100-share minimum, or that every broker offers the same way to deal in it. The useful starting point is narrower: understand the exchange’s domestic-stock trading unit, then check the exact instrument and your broker’s rules.
Why Japanese domestic stocks use 100-share trading units
JPX says domestic-stock trading units are set under each listed company’s articles of incorporation and are now 100 shares. The exchange completed its move to a single 100-share domestic-stock unit on 1 October 2018 after a long standardization effort that had reduced several historical lot sizes.
In plain English, a trading unit is the normal increment in which an order is entered into the market. For a standard domestic-stock order, that usually means 100, 200 or 300 shares rather than 1, 2 or 3. It is an order-size convention, not a statement about the company’s value or an instruction to buy.
JPX’s Trading Unit page is the primary reference. Its standardization history explains why older material can mention several different Japanese lot sizes.
How to calculate the standard order value
For a domestic stock that uses the standard 100-share unit, multiply the displayed yen price by 100. This gives the share consideration only; it is not a complete estimate of what leaves an investor’s account.
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| Displayed share price | Standard unit | Share consideration before costs | What the calculation does not include |
|---|---|---|---|
| ¥500 | 100 shares | ¥50,000 | Broker commission, currency conversion, taxes, or fees |
| ¥2,400 | 100 shares | ¥240,000 | Broker commission, currency conversion, taxes, or fees |
| ¥8,750 | 100 shares | ¥875,000 | Broker commission, currency conversion, taxes, or fees |
The table is a calculation method, not a quote screen. Replace the example price with the current price of the specific security and verify the trading unit in the issuer’s materials or your broker’s order ticket before placing an order.
A share split can lower the yen cost of a 100-share unit while leaving the unit itself unchanged. ATG Press’s guide to Japan investment units and share splits explains why the size of the investment unit matters to issuer disclosures and market accessibility.
When the 100-share rule does not answer the whole question
The 100-share explanation is deliberately limited to domestic stocks. Treat the following as separate checks rather than exceptions you can safely ignore.
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| Instrument or route | Can you assume 100 shares? | What to check instead |
|---|---|---|
| TSE domestic stock | Usually the standard unit | Confirm the current unit and broker order ticket. |
| TSE foreign stock | No | JPX says foreign-stock units can range from 1 to 1,000 shares based on price under TSE rules. |
| ETF, fund or derivative | No | Check the product specification and trading venue. |
| Broker fractional-share or odd-lot service | No | Check the broker’s own terms, execution method, costs and availability. |
| ADR or another overseas listing | No | Check the overseas venue and the depositary-security terms. |
The JPX foreign-stocks trading guide is a useful reminder that foreign stocks listed in Tokyo have their own unit rules. An American depositary receipt (ADR) is also a different security from the Tokyo ordinary share, even when both relate to the same company. See ATG Press’s guide to matching Japanese tickers and ADRs before treating a familiar overseas symbol as a direct substitute.
A four-step check before using a Japanese quote
- Identify the venue and product: domestic TSE stock, foreign stock, ETF, fund, derivative or ADR.
- Confirm the trading unit shown by the issuer, JPX or your broker instead of relying on an old market rule.
- Multiply the current quoted price by the relevant unit, then add your broker-specific cost assumptions separately.
- Check whether a share split, corporate action, trading halt or broker service restriction changes the practical order path.
For timing, pair this order-size check with ATG Press’s Japan stock market hours guide and the 2026 NISA guide, where NISA is Japan’s tax-advantaged individual savings-account programme.
Key takeaways
- JPX says the current trading unit for domestic stocks is 100 shares.
- A quick standard-order calculation is the current yen share price multiplied by 100, before costs.
- Do not assume 100 shares for foreign stocks, ETFs, derivatives, ADRs or a broker’s fractional-share service.
- The exchange rule helps interpret an order ticket; it does not replace instrument-specific or broker-specific verification.
Sources
- Japan Exchange Group, Trading Unit — Trading Rules of Domestic Stocks. Accessed 10 September 2026.
- Japan Exchange Group, Standardization of Trading Units. Accessed 10 September 2026.
- Japan Exchange Group, Trading (Foreign Stocks). Accessed 10 September 2026.
This article is for informational purposes only and does not constitute investment advice.
