“I should've gone bigger. I knew that setup was good.”
Have you caught yourself thinking this?
Why does knowing the trade won make a responsible risk decision suddenly feel like a mistake?
What's happening psychologically?
The trader is evaluating risk using information not available when the trade was entered. Before entry the outcome was uncertain; afterward, the win makes a larger position look obvious. The money that could have been made becomes more noticeable than the risk avoided.
An appropriately sized winning trade can start feeling like failure simply because you imagine a more profitable alternative. The relevant question is whether size was justified by the information and limits available at the time, not how much it could have earned.
Often preceded by
Strong winning trades, large moves after entry, comparing actual and hypothetical profit.
May involve
Hindsight bias, counterfactual thinking, regret, outcome bias.
Can lead towards
Oversizing future trades, abandoning risk limits, increased performance pressure.
Catch it
Notice when review concentrates on hypothetical profit rather than whether the risk decision followed the plan.
Interruption question
“If this trade had lost, would I still believe the larger position size was justified?”
When this thought might be reasonable
Position sizing can be revised with enough evidence. A single win is not proof that more risk should have been taken.