Compare markets rather than guessing from one chart
A stock chart tells you what moved, but not what other markets were doing. Jibun Stocks lets you put charts from different categories into one tab. For Japan, the Nikkei 225, TOPIX, USD/JPY and the Japan 10-year government bond yield offer a view of equities, currencies and rates. The purpose is to identify changes worth investigating, not to have the board automatically establish their cause.
Read the index change first, then inspect the shape of the line and the time of the move. Look for changes in currencies or yields around the same time. A repeatable order helps you organize observations before reading the news. Open a chart to inspect it more closely and read its description: similar-looking lines can represent different measurements and time windows.
Use index differences as a clue to market breadth
The Nikkei 225 and TOPIX are both major Japanese equity benchmarks, but their composition and calculation differ. The Nikkei is a price-average index of 225 selected stocks; TOPIX uses free-float-adjusted market capitalization. If the Nikkei rises strongly while TOPIX barely moves, investigate whether buying is concentrated in stocks with a large impact on the Nikkei. One index does not establish that all stocks are rising.
Add an individual stock or ETF beside the indexes to compare a sector or holding with the broader market. This can help distinguish a market-wide move from a company-specific one. Do not attribute an index difference to a particular company without checking. The official index handbook linked below explains the calculation principles.
Check what a USD/JPY move means
USD/JPY is the number of yen needed to buy one U.S. dollar. A higher number means a stronger dollar and weaker yen; a lower number means the opposite. Alongside Japanese equities, it provides context for exporters' earnings expectations and the yen value of overseas assets. A weaker yen does not guarantee higher stocks: import costs, raw materials and currency hedging can change the effect on a company.
Japanese stock charts mainly cover the regular session, while USD/JPY normally uses a rolling 24-hour window. Their left edges therefore need not represent the same time. Lunch breaks and weekend closures also affect the presentation. Check the time range when a large move catches your attention, then compare it with the timing of economic releases or company announcements.
A yield chart is not a bond-price chart
The Japan 10-year chart displays a yield. For existing fixed-rate bonds, rising market rates generally correspond to falling prices; a higher yield is not the same thing as a bond gaining value. A move from 1.00% to 1.10% is 0.10 percentage points, but a 10% relative increase in the number. That is not equivalent to a stock price rising 10%. Always check the unit and reference value.
Stocks and yields rising together can prompt an investigation of stronger growth expectations; stocks falling with yields can prompt a look at demand for safer assets. These are analytical hypotheses, not automatic conclusions. Yield histories can contain gaps, which do not prove that nothing moved during the missing period. Check display status, comparison windows and event timing before using the market blog to explore the background.
Display behavior checked on October 4, 2026. Examples are illustrative, not investment advice. See the disclaimer.