Definition
Confirmation Bias in Stock Picking
Confirmation bias in stock picking is the habit of researching a stock only to validate a decision you have already made, ignoring warning signs.
Once emotionally or financially committed, an investor reads only bullish analyses, follows like-minded voices, and rationalises every disappointing result. This selective attention deepens conviction in a possibly flawed thesis and delays exiting a deteriorating position, a particular hazard in concentrated portfolios.
The remedy is to deliberately build the bear case: list what could go wrong, seek out credible critics, and define in advance the evidence that would prove you wrong and trigger a sale. Writing down the original thesis lets you later judge it honestly rather than through a confirming lens.
Related terms
- Confirmation BiasConfirmation bias is the habit of seeking out and believing information that supports what you already think, while dismissing evidence that contradicts it.
- Overconfidence BiasOverconfidence bias is the tendency to overestimate your own knowledge, skill or accuracy, leading to excessive trading and concentrated bets.
- Anchoring to Purchase PriceAnchoring to purchase price is the specific bias of fixating on what you paid for an investment, letting that number drive decisions to hold or sell.
Plain-English explainer from The Dispatch Investors Encyclopedia. General information, not financial advice.