Answering Why Trading and Why This Firm

"Why trading?" and "why this firm?" are asked in nearly every quant interview, which means most candidates have a rehearsed answer — and most rehearsed answers are generic enough to be interchangeable between firms. "I love markets and problem-solving" could be said by anyone applying anywhere. The question isn't really testing whether you have a reason; it's testing whether your reason is specific enough to be believable.

Make the answer falsifiable

A good "why trading" answer names something concrete that would be false if said about a different career — a specific thing you like about the feedback loop, the type of problem, or the way skill and luck interact, backed by an example from something you've actually done, like a trading competition, a personal portfolio, or a research project where you got fast, unambiguous feedback on whether you were right. "I like that markets tell you within days whether your reasoning was correct, unlike most jobs where you wait months for feedback" is a real, checkable reason. "I've always been interested in finance" is not.

"Why this firm" requires the same specificity, aimed at the firm rather than the industry: something about their strategy type (market-making versus systematic mid-frequency versus discretionary), their size, or their culture that you could only say credibly if you'd actually researched them — not a line that would work equally well pasted into an application to their nearest competitor. Mentioning a specific desk, a specific published paper from their research team, or a specific reason their approach fits how you think shows you did the homework the question is checking for.

Example

Weak: "I want to work at this firm because it's a top prop shop with smart people and great culture." Strong: "I'm drawn to market-making specifically because it rewards fast, disciplined reasoning under uncertainty rather than long-horizon conviction, which matches how I did in the trading game at [competition] — and this firm's focus on [specific product or market] is exactly the kind of high-frequency feedback loop I want to be in."