JPX Trading by Type of Investors data shows how different investor groups bought and sold Japanese shares during a stated period. For international investors, its most useful weekly number is often foreign net buying: purchases by the `Foreigners` category minus its sales. But the figure is easy to misread unless you first choose the correct market sheet, confirm that you opened the trading-value file, preserve the source unit and understand that `Foreigners` means non-residents under the JPX definition.
This guide explains the official files, the calculation and the interpretation limits. It also works through the latest available weekly observation as of August 19, 2026. That example is dated; the workflow is designed to be reused every week.
Key takeaways
- Start from the official JPX weekly page and choose `Value`, not `Volume`, when you want a yen flow.
- Decide whether the question concerns TSE Prime alone or the broader `Tokyo & Nagoya` aggregate before copying any number.
- Calculate net buying as purchases minus sales. A negative balance is net selling.
- The workbook is denominated in JPY thousands. Divide by 1,000,000 to express a balance in JPY billions.
- `Foreigners` is principally a residence-based category. It is not a simple count of overseas passports, brands or parent companies.
- A weekly flow is evidence about transactions within the survey scope, not proof of investor motives, ownership changes or the cause of a price move.
What JPX Trading by Investor Type measures
The JPX survey outline says the equity series covers domestic common stocks of Japanese companies listed on the Tokyo Stock Exchange and Nagoya Stock Exchange, subject to stated exclusions. Exchange-traded funds, real estate investment trusts, preferred shares and several other instrument types are outside this equity table. JPX publishes separate investor-type pages for ETFs and REITs.
The transaction scope is broader than continuous auction trades alone. It includes regular auction trading and specified off-auction transactions, including ToSTNeT trades on the Tokyo Stock Exchange and N-NET trades on the Nagoya Stock Exchange. ToSTNeT is the TSE's off-auction trading system; its modules include single-stock, basket, closing-price and own-share-repurchase transactions.
The survey does not claim to capture every possible trade by every intermediary. JPX describes the reporting population as general trading participants with capital of at least JPY 3 billion. The August 2026 week-one workbook identifies 51 participating firms. Treat the result as a consistent exchange survey within that scope, not as a complete beneficial-owner ledger.
How to download the correct JPX file
Open the official weekly Trading by Type of Investors page. JPX presents both `Volume` and `Value` downloads for each week. Use the value workbook when the question is how many yen an investor group bought or sold. The volume file answers a different question in shares.
Each current equity workbook contains four worksheets:
Swipe horizontally to view all columns.
| Worksheet | What it covers | Best use |
|---|---|---|
| TSE Prime | Prime Market domestic common shares in the survey | Large-company and Prime-only flow analysis |
| TSE Standard | Standard Market domestic common shares in the survey | Standard-only flow analysis |
| TSE Growth | Growth Market domestic common shares in the survey | Growth-company flow analysis |
| Tokyo & Nagoya | The published aggregate across eligible Tokyo and Nagoya markets | Broad cash-equity flow analysis |
Swipe horizontally to view the full table on mobile.
Never add the three TSE segment balances and call the result `Tokyo & Nagoya`: the broader sheet also reflects eligible Nagoya-listed shares. Conversely, do not quote the broader sheet as a TSE Prime result. Record the sheet name beside every extracted figure.
JPX says the weekly page is normally updated at about 3:30 p.m. on the fourth business day of each week. Holiday weeks can shift the practical timing. Always record the data period printed inside the workbook rather than assuming that the webpage date is the trading week.
How to calculate foreign net buying
Use this formula:
`Net buying = Purchases - Sales`
If purchases exceed sales, the balance is positive and the category was a net buyer. If sales exceed purchases, the balance is negative and the category was a net seller. The workbook displays a balance, but recomputing it is a useful transcription check.
The weekly value workbook labels its currency unit as `1,000 yen`. Convert carefully:
- JPY million = workbook value divided by 1,000
- JPY billion = workbook value divided by 1,000,000
- JPY trillion = workbook value divided by 1,000,000,000
Do not divide a second time because the sales and purchase cells already carry the JPY-thousand unit. Keep the unrounded source values in your research notes, then round only the reader-facing result.
How JPX defines foreign and domestic categories
The `Foreigners` label is narrower and more technical than it looks. JPX principally defines it through non-resident status under Japan's Foreign Exchange and Foreign Trade Act. Overseas branches and subsidiaries of Japanese companies can therefore be included as foreigners. Japanese subsidiaries of foreign companies are residents and are classified according to their relevant domestic investor category. Certain Japanese branches of foreign securities companies also fall within the foreign category under the detailed rule.
This is why `Foreigners` should not be paraphrased as `foreign funds` or `overseas institutions`. The workbook separately shows foreign institutions and foreign individuals, while the headline foreign balance combines them.
Other labels also require care:
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| JPX category | Practical reading caution |
|---|---|
| Securities companies | Brokerage orders from other securities companies; participant proprietary trading is reported under `Proprietary` instead |
| Investment trusts | Japanese investment-trust and asset-management entities within JPX's definition |
| Business companies | Operating and holding companies that do not fall into the other specified groups |
| Trust banks | Trust banks that meet the JPX membership definition; the label can capture institutional asset-management activity but does not reveal the ultimate beneficiary |
| Individuals | Individual brokerage activity; the workbook also separates cash and margin transactions in a supplementary section |
Swipe horizontally to view the full table on mobile.
The investor-type balance is an order-flow classification. It does not replace share-ownership disclosures, large-shareholding reports or custodian data. For a company-level ownership question, pair it with filings and identifier checks. ATG Press's guides to Japanese stock tickers and ADRs and EDINET annual securities reports cover those source-matching steps.
A dated example from August 2026
The latest weekly file available on August 19 covered August 3–7, 2026 and was posted on the JPX page updated August 14. The following calculations use the `Tokyo & Nagoya` worksheet in the official trading-value workbook.
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| Investor category | Sales | Purchases | Net buying | Share of brokerage value |
|---|---|---|---|---|
| Foreigners | JPY 37.845tn | JPY 37.462tn | -JPY 382.8bn | 67.7% |
| Individuals | JPY 14.537tn | JPY 14.380tn | -JPY 156.7bn | 26.0% |
| Business companies | JPY 677.4bn | JPY 1.766tn | +JPY 1,088.3bn | 2.2% |
| Trust banks | JPY 995.4bn | JPY 1.165tn | +JPY 169.7bn | 1.9% |
Swipe horizontally to view the full table on mobile.
The foreign calculation is JPY 37.462 trillion of purchases minus JPY 37.845 trillion of sales, producing net selling of JPY 382.8 billion after rounding. The 67.7% figure is foreigners' share of total brokerage trading value in that worksheet and week. It is not their share of Japanese equity ownership.
The business-company balance is unusually large relative to that category's turnover share, but the table alone does not say why. The published transaction scope includes off-auction own-share repurchase trading, so company buybacks are one possible contributor that must be checked against actual corporate disclosures. A large weekly balance is a prompt for source matching, not a conclusion about motive.
Five common interpretation mistakes
1. Treating one week as a trend
A weekly balance can be dominated by portfolio rebalancing, large placements, buybacks, holidays or a few unusually large transactions. Compare several weeks and preserve a consistent sheet and unit before describing a trend.
2. Equating net buying with price impact
Every completed trade has a buyer and a seller. The investor-type table classifies the two sides; it does not estimate how aggressively orders moved prices. Compare the flow with turnover, index performance and company-specific events, but do not claim causation from timing alone.
3. Reading turnover share as ownership share
The percentage column describes a category's share of brokerage sales, purchases or total trading value for the period. It is not a stake in the listed market.
4. Mixing flow datasets
JPX publishes separate series for equities, ETFs, REITs and monthly non-resident investment by region. The regional non-resident table answers a geographic question and runs on a different frequency; it should not be pasted into the weekly equity series as though the definitions and periods were identical.
5. Using the flow table as a short-position report
Investor-type trading and disclosed short positions are different datasets. A sale in the weekly flow table is not automatically a short sale. The ATG Press guide to Japan short-selling data explains the separate transaction-share, trigger and reportable-position series.
A repeatable weekly research workflow
1. Save the official page URL, access date and the workbook's printed trading period. 2. Choose `Value` for yen flows and `Volume` only for share counts. 3. Select one worksheet and record its exact name. 4. Copy sales, purchases, balance and ratio for the categories you need. 5. Recompute purchases minus sales in the original JPY-thousand unit. 6. Convert units once, retaining the source values in your notes. 7. Compare at least four consecutive observations before calling a pattern persistent. 8. Check corporate filings, market events and other official datasets before offering a causal explanation.
This workflow complements, rather than replaces, company-level research. The TSE cost-of-capital disclosure list can help identify the reform backdrop, while EDINET and company filings provide the event evidence needed to test a flow-based hypothesis.
Sources
- Japan Exchange Group, Weekly Equities — Trading by Type of Investors, page updated August 14, 2026; accessed August 19, 2026.
- Japan Exchange Group, Survey Outline and Definition of Investment Categories, page updated April 3, 2022; accessed August 19, 2026.
- Japan Exchange Group, Trading Value of Stocks by Investor Type, August 2026 week 1, data period August 3–7, 2026; accessed August 19, 2026.
- Japan Exchange Group, Investments in Listed Stocks by Nonresidential Investors by Region, page updated July 17, 2026; accessed August 19, 2026.
Disclaimer
This article is for informational purposes only and does not constitute investment advice.
