Japan’s stock market closes, yet the Nikkei after-hours chart keeps moving. Before the U.S. session begins, S&P 500 and Nasdaq 100 derivatives move up and down. The explanation starts with a distinction: the regular stock market and products referencing it are separate markets.
Extended-hours activity often takes place in derivatives—futures, CFDs and perpetual futures—rather than the underlying shares themselves. Their trading schedules allow expectations to become prices outside the cash session. On Jibun Stocks, the “24h” category brings these moves together. It does not mean every instrument trades without interruption every day.
A regular index is a calculation; a derivative has a traded price
The Nikkei 225 and S&P 500 aggregate constituent share prices under defined rules. The index is not itself a share being bought and sold. Its closing value remains after the regular session ends. Futures and CFDs referencing the index have their own transactions and pricing, so they can respond to new information while the cash index is stationary.
For example, stronger-than-expected U.S. economic data released after Japan’s close might lift U.S. equity futures and expectations for Japanese companies. A Nikkei-linked after-hours instrument may rise. The official Nikkei close has not changed: expectations have changed between cash sessions.
| Type | What the price represents | Schedule and expiry |
|---|---|---|
| Regular stock index | A measure calculated from constituent share prices | Updated under the cash market and index calculation rules |
| Dated futures | A traded contract for future settlement | Exchange trading hours and a defined expiry |
| CFD | A contract settling changes in a referenced price | Hours and terms depend on the provider and instrument |
| Perpetual futures | A contract without expiry, using mechanisms to limit divergence from a reference price | Funding and trading rules depend on the contract |
CFDs settle price differences
CFD stands for contract for difference. Rather than owning the referenced shares or index constituents, the holder settles the difference between opening and closing contract prices. Buying an index CFD does not make the buyer a shareholder in its constituent companies.
CFD quotes reflect related futures or cash prices, provider pricing and supply and demand. They can track an index closely without matching its level exactly. Interest and dividend adjustments, bid–ask spreads and holding costs are also part of the product. For market observation, direction and distance from the regular close are more useful than expecting identical numbers.
Perpetual futures use funding instead of a fixed expiry
Dated futures expire; perpetual futures do not have a scheduled maturity. Funding is one mechanism used to keep their prices near the referenced asset as trading continues.
Hyperliquid’s funding documentation specifies hourly payments. A positive rate means longs pay shorts; a negative rate means shorts pay longs. When demand on one side creates a premium, carrying costs can encourage participation on the other side. This is an economic incentive to limit divergence, not a guarantee that prices always match.
Jibun Stocks’ extended-hours category contains charts using perpetual futures as well as CFDs. Similar display names do not make the contracts identical. Read the individual chart explanations to understand what each line represents.
Twenty-four hours is not the same as seven days a week
A product trading for most of each weekday is different from one available on weekends. Exchange futures can have daily breaks; CFDs have instrument-specific schedules, holidays and maintenance. Weekend instruments can also be separate from weekday products. IG’s dealing-hours guidance distinguishes regular and weekend markets and notes variations by instrument and holiday.
Crypto markets continue through weekends, but an equity-linked contract on a crypto trading platform does not automatically inherit identical conditions. Rules for reference prices and trading when the underlying exchange is closed matter just as much as the platform’s availability.
After-hours prices are not a guaranteed preview of the next open
These prices show how participants currently assess new information before the cash market reopens. Participation and order-book depth can be lower overnight. Smaller orders may move prices further, and spreads can widen. When the regular session brings more participants, the assessment can change.
Watch persistence as well as direction. A jump after an economic release that soon reverses has not established a durable new level. A move that holds, with related indexes and currencies responding to the same information, points toward a more widely shared market assessment.
Place regular and after-hours charts side by side
Put the Nikkei 225 next to its after-hours chart, then add USD/JPY and a U.S. index. The regular index shows where the session ended; the after-hours instrument shows the response afterward. A weaker yen, rising U.S. equities and a stronger Nikkei-linked instrument together suggest export-sector expectations and global equity buying are reinforcing each other. If only the after-hours instrument jumps, check whether other markets confirm the move.
For after-hours charts that use a regular index close as their baseline, the reference is the previous session’s close while the cash market is open, and the latest confirmed close after it closes. A displayed +1% means the derivative is above that cash-index reference. It does not necessarily mean a 1% gain over the last 24 hours. The chart’s rolling time window and its percentage-change baseline are different concepts.
For an illustrative calculation, a cash close of 40,000 and an after-hours price of 40,400 produce +1%. Those are hypothetical numbers, not a forecast of the next opening level. A baseline change at the cash close can also change the displayed percentage even if the derivative price barely moves. Separate price movement from reference-value updates.
The value of extended-hours charts is not simply longer trading access. They reveal how views on news, yields and currencies change while the cash market is closed. Treat the regular index as the session’s result and the after-hours chart as the assessment that follows: together, they provide a clearer starting point for the next session.
