Sales & trading interviews are fundamentally different from investment banking interviews. There's no standard "walk me through a DCF" equivalent. Instead, desks want evidence that you think quickly under uncertainty, understand risk, and can communicate a view clearly.
This guide covers every question type you'll face, with frameworks that work across desks—from rates to equities to commodities.
The Four Question Categories
S&T interviews draw from four distinct pools. The weighting depends on the desk and firm, but every candidate should prepare across all four.
| Category | Weight | What It Tests |
|---|---|---|
| Market Questions | 30-40% | Commercial awareness, ability to form and defend a view |
| Math & Probability | 20-30% | Quantitative reasoning, mental math speed |
| Brainteasers | 15-25% | Structured thinking, composure under pressure |
| Behavioral | 15-20% | Fit, motivation, communication clarity |
Market Questions
These are the signature S&T questions. Interviewers want to see that you follow markets actively and can articulate why something is happening—not just what happened.
Example Questions
"Pitch me a trade."
This is the single most common S&T interview question. A strong answer has five elements:
- Thesis: What you believe and why (macro, micro, or technical catalyst)
- Instrument: How you'd express it (equity, option, swap, futures)
- Entry/Exit: Where you'd enter and where you'd take profit or cut losses
- Risk: What could go wrong and how you'd hedge
- Timeframe: Days, weeks, or months
Bad answers pitch a stock like you're in an equity research interview. Good answers demonstrate you understand risk/reward asymmetry and position sizing.
"Where is the 10-year Treasury trading and why?"
Know the level. Know the recent direction. Have a view on where rates are heading and what's driving it—Fed policy, inflation data, supply/demand dynamics, term premium. Saying "I think rates go higher" without a catalyst is insufficient.
"If you were a portfolio manager with $100M, how would you allocate it today?"
This tests breadth. Touch multiple asset classes. Explain your macro view and how the allocation reflects it. Mention specific risks you're hedging against.
Preparation Framework
- Track 3-5 markets daily (e.g., S&P 500, 10Y UST, EUR/USD, crude oil, VIX)
- Read one macro piece daily (Fed speeches, BLS data releases, earnings calls)
- Maintain 2-3 trade ideas at all times with specific entry/exit levels
- Practice explaining your views aloud in under 60 seconds
Math & Probability Questions
These test speed and comfort with numbers. You won't have a calculator. Interviewers care about your approach as much as the answer.
Example Questions
"I flip a fair coin until I get heads. You pay me $2^n where n is the number of flips. How much would you pay to play this game?"
This is a variant of the St. Petersburg Paradox. The expected value is infinite (each flip contributes $1 to EV), but no rational person pays infinite money. The interviewer wants to hear you discuss expected value versus risk tolerance and practical bankroll constraints. A reasonable answer: $20-30, reflecting real-world risk aversion.
"What's the probability of getting at least one six in four dice rolls?"
Use the complement: P(at least one 6) = 1 − P(no sixes) = 1 − (5/6)^4 ≈ 1 − 0.482 = 51.8%.
"Estimate 37 × 43 in your head."
Use (40 − 3)(40 + 3) = 1600 − 9 = 1,591. Interviewers want to see you use shortcuts, not brute force.
Common Math Topics
| Topic | Frequency | Example |
|---|---|---|
| Expected value | Very high | Coin flip games, dice games |
| Conditional probability | High | Card problems, Bayes' theorem |
| Mental arithmetic | High | Multiplication, percentages, square roots |
| Combinatorics | Medium | Poker hands, arrangement problems |
| Options pricing intuition | Medium | Why is a straddle worth X? |
Brainteasers
Brainteasers test how you decompose an unfamiliar problem. Pausing to think is fine—guessing wildly is not.
Example Questions
"How many golf balls fit in a school bus?"
Estimate the bus interior volume (~2.5m × 2m × 8m = 40 m³, minus seats ≈ 25 m³ usable). Estimate a golf ball's volume (~40 cm³ or 0.00004 m³). Account for packing efficiency (~64% for random packing). Result: 25 / 0.00004 × 0.64 ≈ 400,000 golf balls. The exact number doesn't matter—the structured approach does.
"You have 12 balls, one is heavier or lighter. You have a balance scale and 3 weighings. Find the odd ball."
This is a classic information theory problem. With 3 weighings you can distinguish among 3³ = 27 outcomes, which is enough to identify 1 of 12 balls and determine heavier/lighter. Walk through the grouping strategy: split into three groups of four, weigh two groups, and use the result to narrow down.
"Two trains are 100 miles apart heading toward each other at 50 mph each. A fly starts at one train and flies back and forth at 75 mph. How far does the fly travel before the trains collide?"
The trains close at 100 mph combined, so they collide in 1 hour. The fly travels at 75 mph for 1 hour = 75 miles. Don't try to sum the infinite series—use the simple shortcut.
Recommended Resource
Finance Technical Interview Guide
80+ pages. 8 chapters. Every question tagged by frequency with dual-format answers.
How to Practice
- Do 2-3 brainteasers daily for 4-6 weeks before interviews
- Practice talking through your reasoning out loud
- "Heard of Fifty Challenging Problems in Probability" by Mosteller and "Vault Guide to Finance Interviews" are solid resources
Behavioral Questions
S&T behavioral questions are less formulaic than banking but equally important. Desks are small teams—cultural fit matters enormously.
Key Questions and What They're Really Asking
| Question | What They Want to Hear |
|---|---|
| "Why S&T over banking?" | You genuinely prefer markets, speed, and risk over process-driven advisory |
| "Why this desk?" | You understand the product and have a specific reason (not "I like trading") |
| "Tell me about a time you took a risk." | Evidence of calculated risk-taking with awareness of downside |
| "Describe a mistake and what you learned." | Accountability, self-awareness, ability to learn from losses |
| "How do you handle stress?" | Composure—they need to know you won't panic during a market sell-off |
Answer Framework
Keep behavioral answers under 90 seconds. Use the STAR format (Situation, Task, Action, Result) but front-load the result:
"I lost 15% on a position because I ignored a key risk signal. Here's what happened and what I changed..."
Traders respect directness. Don't bury the lead.
Desk-Specific Question Patterns
Different desks emphasize different areas. Tailor your preparation accordingly.
| Desk | Primary Focus | Secondary Focus |
|---|---|---|
| Equities (Cash) | Market questions, stock pitches | Behavioral |
| Equity Derivatives | Options theory, Greeks, vol | Math/probability |
| Rates | Macro views, curve dynamics | Math/probability |
| FX | Global macro, central bank policy | Market questions |
| Credit | Relative value, spread analysis | Math (bond math) |
| Commodities | Supply/demand fundamentals | Market questions |
The 4-Week Preparation Strategy
| Week | Focus | Daily Time |
|---|---|---|
| 1 | Build market awareness habit. Read macro daily. Track key levels. | 1.5 hours |
| 2 | Math and probability. Drill mental math. Work through probability problems. | 2 hours |
| 3 | Brainteasers and trade pitches. Develop 3 polished trade ideas. | 2 hours |
| 4 | Mock interviews. Combine all categories. Practice under time pressure. | 2.5 hours |
Start reading the Financial Times or Bloomberg daily at minimum 4 weeks before your first interview. Surface-level market knowledge is immediately obvious to interviewers who trade these markets every day.
Common Mistakes That Kill S&T Candidacies
- No market view: Saying "I don't follow markets closely" in an S&T interview is disqualifying
- Treating it like banking: Don't pitch stocks using a DCF—pitch trades with risk/reward
- Freezing on math: Practice enough that basic probability feels automatic
- Vague motivation: "I like the fast pace" is generic. Tie your motivation to a specific market experience
- Ignoring risk: Every trade pitch must address what could go wrong
The Bottom Line
S&T interviews reward preparation breadth over depth. You need to be conversational about markets, comfortable with quantitative puzzles, and able to communicate clearly under pressure. The candidates who stand out aren't the ones with the most complex trade pitches—they're the ones who can explain any idea simply and defend it against pushback.
Start preparing early. Markets knowledge compounds, and there's no shortcut for genuine commercial awareness.
Building your S&T application? Our Sales & Trading Resume page helps you position your experience for trading desks at bulge brackets and top prop shops.
Related Reading
- 100 Investment Banking Technical Questions — Technical prep for the banking side
- Walk Me Through Your Resume: Interview Guide — Nail the opening question in any finance interview
- How Finance Jobs Are Actually Filled in 2026 — Understanding the recruiting landscape