Talking About Losses and Mistakes

"Tell me about a time you lost money" or "tell me about a mistake you made" is a near-universal question, and it's genuinely testing something important: how you behave after things go wrong, which every trader eventually has to deal with. The candidates who answer this badly usually fall into one of two traps — either they pick an example so trivial it proves nothing, or they tell a story about a loss without ever taking clear ownership of the decision that caused it.

Pick a real example and own the decision

Choose an example where you actually made a consequential choice — not just "the market moved against me," which describes every loss ever, but a specific decision you made that, in hindsight, was wrong given what you knew or should have known at the time. "I held a position too long because I was anchored to my entry price, even after new information should have changed my view" names an actual decision error, not just bad luck.

Then show what changed afterward. The strongest version of this answer isn't the size of the loss, it's the specific process change that followed it: a rule you now follow, a check you now do before sizing a position, a habit you built to catch the same mistake earlier next time. "After that, I started writing down my thesis and an invalidation condition before every trade, so I'd notice sooner when the thesis had actually broken" shows the loss produced a durable improvement, not just a bad memory.

Example

Weak: "I lost money on a trade once because the market was really volatile that week." Strong: "In a trading simulation, I kept a losing position because I didn't want to lock in the loss, even after data came out that should have changed my view. I realized afterward I was anchoring to my entry price instead of updating on new information — now I write an explicit invalidation condition before I enter any position, so I have a rule to follow instead of a feeling to fight."