FOMO (fear of missing out) in trading is entering a position primarily because price has already moved and you are afraid of missing further gains. The decision comes from the market's recent action, not from an independently valid setup, so it skips the plan entirely.
How it works
The tell is the source: a FOMO entry starts from 'price already moved', while a plan-based entry starts from a rule that fired.
A missed move is a completed event; treating it as a reason to act now is what turns a normal observation into a chase.
Why it matters
FOMO entries usually have no defined stop or size, because the urgency replaced the planning.
The occasional chase that works reinforces the habit, making the next chase larger and the eventual damage worse.
A simple market example
A trader watches an asset rally for an hour without being in it, then buys near the top without a plan because missing more feels worse. The entry is a reaction to the move, not a new setup.
Common mistakes
Treating the rally as evidence about the next move, when it is information about a move that already finished.
Confusing a plan-based late entry with FOMO. The test is the source of the decision, not the timing.
Frequently asked questions
Is every late entry FOMO?
No. A late entry can be plan-based if a rule fired and the setup is independently valid. FOMO is defined by the source of the decision.
Why does FOMO feel so strong?
Watching a missed move feels like a loss. The feeling is real, but it is not evidence about the next move.
How do I defend against it?
Write the entry rule before the session, and pause before acting: name the feeling, check for a new setup, compare to the plan.
Educational content only. Definitions describe common market usage and may vary by jurisdiction, instrument, or institution.