Name the market, venue and regime
NYSE lists its core stock session as 09:30–16:00 Eastern Time. These are checked hours for a particular market, not universal hours for all instruments. Early and late availability depend on venue, security and intermediary.
The SEC describes different order availability, participants, market makers and data outside regular hours. Some intermediaries accept only limit orders then. A common ticker does not establish the same regime access.
Equal midpoints do not imply equal spreads
Bid is the buyers’ quote, ask the sellers’ quote; the midpoint is their average (bid+ask)/2. Take two invented snapshots of one teaching instrument, in USD per unit. The assumed regular bid/ask is 99.98/100.02; extended is 99.80/100.20. Both midpoints are 100.
Spreads are 100.02−99.98=0.04 and 100.20−99.80=0.40. The second is ten times larger in this example only. This is neither an empirical measurement nor a permanent rule. Two quotes do not establish executable quantity.
| Assumed regime | Bid | Ask | Midpoint | Spread |
|---|---|---|---|---|
| Regular | 99.98 | 100.02 | 100.00 | 0.04 |
| Extended | 99.80 | 100.20 | 100.00 | 0.40 |
Check instruction availability and status separately
Extended trading can involve lower liquidity, wider spreads and trading systems that are not linked. These are risks, not mandatory outcomes for each trade. A price on one venue does not establish the same conditions elsewhere.
Check permitted instructions, routing venue and treatment of the unfilled remainder across regimes. An order can expire or be ineligible for another session. No orders are submitted by this article.
| Question | What to check |
|---|---|
| Instructions | Types accepted in the selected session |
| Duration and remainder | Carryover, expiry or cancellation between regimes |
| Data | Venues, session, delay and price basis |
Establish history coverage before comparing charts
A source may supply only regular hours, separate extended data or another venue set. Identify coverage, price basis and observation time before comparing charts. An absent history row does not prove that no trading happened anywhere.
This is a regime and coverage question, not a new candle formula. Time zones and calendars have a separate explanation. Do not silently change a dataset’s session without checking its rules.
A practical next step with a defined scope
Record source, venue, session and permitted instructions beside the observation. Student Wyckoff analyses supplied history; this article promises no separate extended-session feed or broker execution. Begin by checking the chart actually loaded using the existing guide.
- Equal midpoints do not establish equal costs.
- Do not transfer order status across sessions automatically.
- Do not claim coverage a source does not provide.
Primary sources
Sources explain the mechanics and limitations; the editorial examples use invented numbers rather than market quotations.
Your next practical step
Student Wyckoff Pro helps you study closed bars and save your analysis. It does not execute trades; access and the Windows connection are explained in the guide.
Open the first-chart instructions ↗