Chasing: When To Pay Up

"Chasing" means buying (or selling) after a price has already moved a meaningful amount in your favor, rather than at the level you originally planned to trade at. Every trader who has ever missed a move knows the feeling: the signal said buy at 100, the price is now 104, and the question is whether 104 is still a good entry or whether you're now the last one in before it reverses. Chasing is not automatically wrong — plenty of real, information-driven moves keep going — but it is where trading psychology does the most damage, because the decision to pay up is very easy to justify after the fact and very easy to get wrong in the moment.

What separates a good chase from a bad one

The honest question is whether the reason you wanted the trade in the first place still holds at the new price. If a stock was cheap at 100 because the market was underpricing an earnings catalyst, and it's now at 104 because the catalyst just printed and confirmed the thesis, paying 104 can still be a good trade — the edge moved with the price. If the stock is at 104 purely because it's been going up and other people are chasing too, and your original thesis said 100 was already close to fair value, then paying 104 is not "the same trade at a worse price," it's a different trade with a different, weaker case behind it.

A second question is what a missed trade actually costs. A trader who chases every move out of fear of missing out ends up systematically paying the worst average price in the book — buying strength and selling weakness — because those are exactly the moments emotion is loudest. A trader who never chases ends up sitting out every real trend, because real trends, almost by definition, look like they've "already moved" the moment you notice them. The useful middle ground is a rule decided before the trade, not during it: for instance, capping how far above the intended entry a trader will pay before treating the setup as no longer valid, so the decision isn't made fresh — and under pressure — every single time.

Concretely: a signal flags a stock as undervalued at $50, a trader misses the initial move, and by the time they look again it's at $54. If the model's fair value estimate is $65, paying $54 still captures most of the edge and chasing makes sense. If the model's fair value was only $55, the $54 entry has almost nothing left in it, and chasing there is really just following the tape.