Why market data is delayed

Delayed data is a historical snapshot, not a live tick. That distinction changes what a chart can be used for, and what it cannot.

Many educational market sites show data that is at least 24 hours old. The delay exists because live or real-time market data is usually licensed and distributed under separate commercial terms. A delayed snapshot makes historical chart analysis available without pretending to be a real-time trading terminal.

What a 24-hour delay means

Prices shown on Trend at a Glance are delayed by at least 24 hours. The daily chart is built from completed daily bars, and the latest price is the most recent daily close in our snapshot. During a trading session, the current day may not appear at all. The weekly and two-hour series follow the same principle: they are refreshed from stored bars, not streamed tick by tick.

What delayed data is good for

• Studying chart structure and long-term price behaviour.
• Comparing timeframes and reviewing how an indicator behaved in the past.
• Learning the difference between prices, volume and calculated overlays.
• Building a repeatable chart-review habit.

What it is not good for

A delayed chart cannot tell you the current bid or ask, cannot confirm an order will fill, and should not be used for time-sensitive trading decisions. If you need real-time data for execution, use a licensed real-time data provider and a broker that supports the instruments you trade.

How the snapshot is built

Our US market data is prepared from a private market database and stored as compact chart files. Each stock and timeframe has its own history, and the chart opens a window of recent bars while keeping the full history available for zooming. Because the snapshot is refreshed periodically rather than streamed, every visitor sees the same historical record at the same time.

Why we explain the delay

Transparency about data quality is part of a good research habit. Knowing that a chart is delayed changes how you interpret a pattern near the right edge. A “breakout” that already happened two days ago is history; treating it as a live opportunity would be a category error.