Session Prices and Price States

Session prices and price states covers opening prices, last-sale prints, session highs, and unchanged price labels used to describe market data during a defined trading session.

Use this branch when the meaning of a price depends on the session, timestamp, market calendar, or data field. This content is educational and does not predict where prices will move.

What This Branch Covers

Decision Lens

Session-price labels are only meaningful when the reference period is clear. A high can be intraday, daily, 52-week, regular session, adjusted, or vendor-defined; an opening price can come from an auction or first trade.

Move to Trading Sessions and Halts when the issue is trading hours, halts, or session eligibility. Move to Price Action, Sentiment, and Volatility when the issue is interpreting the price movement.

Evaluation Checklist

• Identify the instrument, exchange, session, reference period, timestamp, and data vendor.
• Check whether the field is adjusted, unadjusted, regular-session only, or extended-hours inclusive.
• Separate quote data from trade prints when reading last sale or high fields.
• Confirm whether halts, auctions, holidays, or late reports affected the field.
• Use consistent session definitions when comparing securities.

Common Mistakes

• Comparing an extended-hours price with a regular-session high.
• Treating last sale as a current executable quote.
• Ignoring adjusted data after dividends, splits, or corporate actions.
• Using “unchanged” without checking the reference price.
• Comparing opening prices across markets with different auction rules.

For broader context, return to Quotes, Prices, and Market Data.

In this section

Choose a subsection first. Deeper term pages live inside each subsection, which keeps large topic hubs readable.