“What would make you wrong?” and other hedge fund interview questions that catch people out

Most hedge fund interviews start with a stock pitch. The pitch is the part candidates prepare for. The questions that follow are where most of them come unstuck.

These questions sound simple. They aren't testing knowledge. They're testing how you think about being wrong, because that's most of the job. Even good investors are wrong a lot of the time. What separates them is how quickly they notice and what they do next.

“What would make you wrong?”

The weak answer is a list of generic risks: competition, the economy, management execution. Every stock has those. Listing them tells the PM you haven't thought about this particular thesis.

The strong answer names one or two specific, observable things that would break your argument and says what you'd do. It ties directly to your thesis, so if your long rests on margins rising, your answer is about the cost line that would show margins aren't rising.

“My thesis is that the new factory cuts unit costs. If gross margin hasn't improved by the second quarter after it opens, I'm wrong and I'd sell.”

What the PM is really listening for is whether you've set your exit before you're emotionally attached. People who decide in advance what would change their mind are easier to manage money alongside.

“Who's on the other side of this trade?”

Every time you buy, someone sells. If your idea is so obvious, why are they selling? Candidates often answer “people who haven't done the work”, which sounds arrogant and is usually untrue.

A better answer explains why a sensible seller might see it differently. Maybe they're funds that can't hold small companies after a share price fall. Maybe they're focused on next quarter and you're looking two years out. Maybe they're right about a risk and you think it's smaller than they do. The PM wants to see that you respect the other side.

“What's priced in?”

This catches people who have a view on the company but not the stock. Saying “earnings will grow 10%” means nothing if the price already assumes 15%.

You should be able to turn the share price into a rough forecast. If a stock trades at 20x earnings and similar companies growing steadily trade at 15x, the market is paying for growth. Your job is to say how much growth and whether you think the company beats or misses it.

“The stock is down 20% since you bought it. What now?”

This is the question that catches out the most people. The two bad answers are opposite. One is “buy more, it's cheaper now”, which ignores the chance that the market knows something you don't. The other is “sell, I was wrong”, which ignores that prices move for reasons unrelated to your thesis.

The PM is listening for process. They want to hear that you separate noise from information and that your pre-set exit actually means something when it's tested.

“How big would you make this position?”

Most candidates haven't thought about sizing at all. You don't need a formula. You need to show that size depends on conviction, on how much you could lose and on how easily you could get out.

A reasonable answer sounds like this: a starter position because the catalyst is six months out, larger after results if the thesis holds and smaller than usual because the stock is thinly traded. That shows you link size to risk rather than to how much you like the idea.

How to prepare for them

Write down your answers to these five questions for every stock you plan to pitch. Then say them out loud. You'll find gaps you didn't see on paper, usually around what's priced in and where you'd exit.

Better still, practise with someone who will push back. These questions only catch you out when they arrive unexpectedly in the middle of a pitch you thought was going well.