Why it matters
Off-market ticks can trigger stops or create chart artifacts. Understanding them helps you separate ‘market move’ from ‘data event’.
Trading use: the point is not vocabulary. The point is prediction: what changes when this shows up?
Common trap
Automatically treating every tick as tradable reality. Some prints are not representative and may be subject to broker ‘manifest error’ clauses.
Example
A one-second spike prints 30 pips away from the surrounding range, triggers stops, then immediately snaps back. That’s likely not a real market trade. It’s a tick event.
Operational cue: if you can’t point to it on the chart, in the DOM, or in your broker logs, treat it as a story and trade smaller.
Notes
Quick rule
- If you see this repeatedly, you are in a different regime than your model assumes.
- Regime change usually means position size change.
- When in doubt: trade smaller, or don’t trade.