Derivatives Foundation interview preparation

Questions

100

Traced to a firm

29

Firms

19

Updated

September 2026

Asked at

All firmsMSMorgan Stanley4Nomura4Akuna Capital2Amundi2HSBC2PIMCO2Bank of America1Barclays1Citadel1DRW1Goldman Sachs1Jane Street1Millennium Management1Mizuho1Old Mission Capital1RCRBC Capital Markets1Scotiabank1UBS1Wells Fargo Securities1

Topic

All topicsForwards and futures10Options basics8Option pricing7The Greeks10Volatility7Option strategies9Swaps and rates7Credit derivatives4Market structure and clearing6Indian derivatives8Trading and markets9Brainteasers6Fit9

Level

AnyCoreIntermediateHard

Type

AnyTechnicalCaseMarket viewBrainteaserFit

1. 036What is the difference between implied and realised volatility, and which one are you actually trading?VolatilityCoretechnicalVolatility tradingProp trading firms

   Say this

   Realised volatility is what the underlying actually did — measured from historical returns. Implied volatility is what the option market is charging, backed out of the price. When you buy an option and delta hedge it, you are long realised and short implied: you make money if the world turns out more volatile than the price you paid.

   Then walk it

   1. Realised is backward-looking and measurable: annualise the standard deviation of log returns, typically by multiplying the daily figure by root 252. The answer depends on your window, which is why people argue about it.
   2. Implied is forward-looking and is a price, not a forecast. It contains the market's expectation plus a risk premium plus supply and demand for that specific strike and expiry.
   3. The trade: buying a delta-hedged option is long realised volatility, short implied. The profit over the life is roughly the gamma-weighted difference between the two, which is why a variance swap — whose payoff is exactly realised variance minus a strike — is the clean expression of the view.
   4. A number to anchor it: Nifty realised volatility runs in the low teens in calm periods while India VIX often sits a few points above. That gap is the premium, and it is persistent enough that systematic short-volatility strategies exist to harvest it.
   5. The two are not even measuring the same object. Implied is a risk-neutral expectation over the option's remaining life. Realised is a sample statistic over a past window. Comparing them requires matching horizons, and most casual comparisons do not.
   6. The limitation to volunteer: implied above realised does not mean options are expensive. It means you are being paid for taking crash risk, and the payment looks generous right up to the point where you find out why it existed. February 2018 and March 2020 are the two reference points.

   Where candidates lose it

   Treating implied volatility as the market's forecast of realised volatility. It is a price with a risk premium in it, and a persistent gap is compensation rather than mispricing. Saying so is what separates an answer from a definition.

   Expect next

   • So is a persistent gap between them an inefficiency?
   • How would you measure realised volatility, and over what window?
   • What is the cleanest instrument for trading realised against implied?
2. 043Explain a covered call. When is it the right trade and what is the real risk?Option strategiesCorephone / first roundWealth managementIndian broking

   Say this

   Long the stock, short a call against it. You collect premium and cap your upside at the strike. It is the right trade when you are mildly bullish to neutral and would be happy to sell at the strike. The real risk is not the stock falling — it is that you have sold the upside tail, which is where most of an equity's long-run return lives.

   Then walk it

   1. Payoff: you keep the premium plus any appreciation up to the strike, and above that you deliver the stock. Below, you take the full downside less the premium you received.
   2. So it is the same payoff shape as a short put at that strike — the synthetic equivalence falls straight out of put-call parity. Anyone selling covered calls should know they are running a short-put risk profile.
   3. When it works: a range-bound stock, a high implied volatility that you think is overpriced, or a genuine intention to exit at the strike. Overwriting is also a legitimate income overlay for a mandate that has to generate yield.
   4. The honest risk: your worst outcome is being right about direction and wrong about magnitude. The stock triples, you delivered at plus 10 percent, and you have converted an asymmetric long-run payoff into a capped one. Equity index returns are driven by a small number of very large up moves, so capping them is expensive.
   5. There is also a tax and path problem in practice: getting called away triggers a realisation you may not have wanted, and rolling the short call up in a rally locks in a loss on the option leg while the stock leg is unrealised.
   6. Where I would actually use it: on a position I already intended to trim, at a strike that equals my target exit price, with the premium as a sweetener. Framing it as income on a core holding you want to keep forever is the mis-sale, and it is a very common one in retail advisory.

   Where candidates lose it

   Selling it as free income. The interviewer will ask what happens in a 40 percent rally, and the answer that gets respect is that a covered call is a short put in disguise and you have sold the fat right tail. Say the synthetic equivalence out loud.

   Expect next

   • What position is a covered call equivalent to?
   • The stock rallies 50 percent. What do you do?
   • Would you recommend a covered call programme to a long-term retirement portfolio?
3. 047Why would you buy a call spread instead of just buying a call?Option strategiesCoretechnicalIndian brokingWealth management

   Say this

   Because you have a target, not an unbounded view. Selling the higher strike funds a chunk of the premium, cuts your theta and vega, and raises your probability of profit — at the cost of capping the payoff. If your thesis is 'up 8 percent by June' rather than 'up a lot', the spread is the honest expression of it.

   Then walk it

   1. Mechanics: buy the 100 call for 5, sell the 110 call for 2, net cost 3, maximum payoff 10 at or above 110. You have turned a 5-point bleed into a 3-point bleed and a 7-point maximum gain.
   2. The Greeks get tamer. Vega and theta both shrink because you are long one option and short another, so a fall in implied volatility hurts far less. If you are worried about buying expensive volatility, the spread protects you against that.
   3. Probability of profit rises because the break-even is nearer. You need the stock at 103 rather than 105, which on a one-month view is a meaningful difference.
   4. It is also a skew trade whether you intend it or not. In an equity index the calls you sell are cheaper in implied terms than the calls you buy, so a call spread is a mildly unattractive skew position. Put spreads in equities work the other way — you sell the expensive wing.
   5. Where it goes wrong: the payoff is capped, so a takeover or a squeeze that takes the stock to 150 pays you the same 7 as a move to 110. If your thesis has a fat-tail scenario in it, the spread is the wrong structure.
   6. And near expiry a spread can be awkward to close — you may have to trade out of two legs in thin markets, or face assignment on one leg and not the other. The neat payoff diagram assumes you hold to expiry, and in practice the exit cost is real.

   Where candidates lose it

   Just saying it is cheaper. Cheaper is not a reason on its own — you paid less and you get less. The answer is about matching the structure to the shape of your view, plus the reduction in vega if you think implied volatility is high. Mention the skew direction to sound like a trader.

   Expect next

   • How does the skew affect a call spread versus a put spread in equities?
   • What if the stock gets taken over at a 50 percent premium?
   • Which leg would you close first if you wanted out early?
4. 052What is an interest rate swap, and why would a company enter one?Swaps and ratesCorephone / first roundRates derivativesCorporate treasury

   Say this

   Two parties exchange interest payments on a notional that never changes hands — typically one pays fixed and receives floating, the other the reverse. Companies use them to change the interest rate character of debt they have already issued, without refinancing it.

   Then walk it

   1. Mechanics: on a five-year, 100 million rupee notional swap, one side pays a fixed rate semi-annually and receives the floating benchmark reset each period. Only the net difference settles, so the cash flows are small relative to the notional.
   2. The classic corporate use: a company issues a floating-rate loan because that is what the bank offered, then pays fixed on a swap to convert it into synthetic fixed-rate debt. It has locked its interest cost without renegotiating the loan.
   3. The reverse is just as common. A company with a fixed-rate bond that wants floating exposure — perhaps because its revenues are rate-sensitive — receives fixed on a swap. This is asset-liability matching, and for a bank it is the core of managing the gap between deposits and loans.
   4. There is also a comparative advantage story, which is where swaps came from: two borrowers each have better access to a different market, so they each borrow where they are cheap and swap the payments. The gain is split between them.
   5. Pricing: at inception the swap has zero value, because the fixed rate is set so the present value of the fixed leg equals that of the floating leg. It then acquires value as rates move, which is how it becomes a live mark-to-market and margin exposure.
   6. The risks to name: rate risk obviously, but also that a hedge which is economically right creates accounting volatility unless you qualify for hedge accounting, and that collateral calls under the CSA can be substantial even when the hedge is doing its job. Treasurers who did not model the collateral drain have been caught out by that more than by the rate move.

   Where candidates lose it

   Describing the exchange of cash flows without saying why a company would bother. The answer is about converting the character of existing debt without refinancing. And notional is not exchanged in a plain vanilla rate swap — saying otherwise gets you marked down instantly.

   Expect next

   • Is the notional exchanged?
   • What is the swap worth on day one, and why?
   • How does a bank use swaps to manage its deposit book?
5. 063When would a client want an exchange-traded derivative and when an OTC one?Market structure and clearingCorephone / first roundSell-side sales and trading

   Say this

   Exchange-traded when they want liquidity, price transparency and no counterparty risk, and they can live with standardised terms. OTC when the exposure they are hedging does not match any listed contract — an odd maturity, an odd notional, a bespoke underlying — and they are willing to pay a wider spread and take credit risk for the precision.

   Then walk it

   1. Exchange: standard size, standard dates, central clearing, continuous two-way prices, and margin set by the exchange. You can get out by trading, not negotiating.
   2. OTC: any terms you can agree. A corporate hedging a 47 million dollar payable on the 14th of March cannot do that with 1,000-lot standard contracts without leaving a residual.
   3. The cost of precision is the spread and the credit. An OTC trade is priced with CVA and funding charges built in, and you are exposed to the dealer — collateralised under a CSA, but exposed between margin calls.
   4. Hedge accounting pushes corporates to OTC too. A precise hedge that matches the exposure qualifies for hedge accounting and avoids profit and loss volatility; a proxy hedge with basis risk may not.
   5. Since 2009 the line has blurred. Standardised OTC products — most vanilla interest rate swaps and index CDS — are now centrally cleared and often traded on electronic platforms, so they have exchange-like credit and margin with OTC-like flexibility on terms.
   6. The practical rule I would give a client: start with the listed market, and only go OTC for the residual you genuinely cannot hedge there. Most treasurers who ended up in trouble had a bespoke structure where a plain vanilla listed hedge would have covered 90 percent of the exposure at a fraction of the cost and with none of the complexity.

   Where candidates lose it

   Presenting it as a two-column comparison table with no judgement. The interviewer wants you to pick, and the answer that lands is 'listed by default, OTC only for the residual you cannot hedge there'. Mention that cleared OTC now sits in between.

   Expect next

   • What does a corporate give up by using a listed contract?
   • How has clearing changed the distinction since 2009?
   • Why does hedge accounting push clients towards OTC?
6. 091How many beds are there in a New York hotel?BrainteasersCoretechnicalHSBCSales and Trading · Hong Kong · 2026

   Say this

   Around 250 to 350 beds for a typical mid-size Manhattan hotel. Build it from the building: about 20 floors, roughly 12 rooms per floor, so around 240 rooms, and about 1.3 beds per room once you account for doubles and suites. That gives roughly 300 beds.

   Then walk it

   1. Clarify the question first — one hotel, not the city, and a typical hotel rather than a specific one. Asking that takes five seconds and prevents answering the wrong question.
   2. Build from the physical structure: a Manhattan hotel on a standard lot, 20 floors, a floor plate that fits about 12 rooms around a central corridor. That is roughly 240 rooms.
   3. Beds per room: most rooms have either one king or two queens. Call it 60 percent single-bed and 40 percent double, so about 1.4 beds a room, less a few floors for lobby, function space and back of house. Round to 300 beds.
   4. Sanity check against known anchors: New York has roughly 120,000 to 140,000 hotel rooms across about 700 hotels, which is an average of about 180 to 200 rooms per property. So my 240 is on the larger side of average, which is fine if I say I am describing a mid-to-large hotel.
   5. That cross-check is the part that earns credit, because it shows I hold one or two real anchor numbers and use them to test a bottom-up estimate rather than relying on either alone.
   6. I would close with the range and the driver: 250 to 350 for a typical property, and the answer scales almost entirely with floors times rooms per floor, so if you tell me it is a 40-storey tower I would double it. Naming what the answer is a function of matters more than the point estimate.

   Where candidates lose it

   Answering a different question — beds in all New York hotels — or giving a number with no structure. Estimation questions are graded on the decomposition and the cross-check, not on accuracy. Build it, then test it against one anchor you actually know.

   Expect next

   • Now estimate the total number of hotel rooms in New York.
   • What is the occupancy rate, and what would that imply for revenue?
   • Which of your assumptions would you check first?

   Reported by candidates at HSBC (Sales and Trading, Hong Kong, 2026). Source: Wall Street Oasis.

7. 092Why derivatives rather than cash equities or another product?FitCorephone / first roundProp trading firmsSell-side sales and trading

   Say this

   Because in derivatives you have to be right about more than direction, and I find that more interesting. A cash trade is a view on a price. A derivative is a view on the price, the path, the volatility and the time, and you can be right about direction and still lose. That structure rewards precision in a way I want to be measured against.

   Then walk it

   1. Lead with the intellectual content, specifically: the payoff is a function rather than a line, so expressing a view means choosing a shape. Deciding between a call spread and a straddle is a more precise act than deciding to buy or sell.
   2. Then the part that is actually true about the job: the risk is multidimensional and it is managed continuously. A delta hedge is a decision you make every day, not a position you take once. That appeals to me more than a research-driven hold.
   3. Then one piece of evidence. Something you have actually done — priced options in a spreadsheet or in Python, run a paper delta-hedging exercise and compared realised profit and loss against implied minus realised, traded a small book, or worked through Natenberg or Hull properly. Name what surprised you when you did it.
   4. Then connect it to their seat rather than to derivatives in general: market making is a different job from structuring, which is different from a rates swaps desk. Say which and why, because 'I like derivatives' is not a career choice.
   5. Then the honest self-assessment, which is what makes it credible: name the part you find hardest. For most people it is holding a losing position to the rules rather than to the feeling, or the fact that the maths is the easy part and the discipline is not.
   6. And keep it short. Ninety seconds. This question is testing whether you know what the job is, not whether you can be enthusiastic about it.

   Where candidates lose it

   Answering with 'I like maths and markets'. Everyone in the room says that. The distinguishing answer names the specific thing derivatives add — you can be right on direction and lose — and backs it with one thing you actually did. Then it names which derivatives seat and why.

   Expect next

   • What is the most interesting thing you learned pricing your first option?
   • Market making or structuring, and why?
   • What part of this job do you think you would be worst at?
8. 093Why sales and trading?FitCorephone / first roundMSMorgan StanleyGlobal Markets · London · 2024

   Say this

   Because the feedback loop is immediate and the scorecard is public. You form a view, you put on risk, and the market tells you within hours whether you were right. I want to be in a seat where the judgement is measured rather than argued about, and where the horizon is short enough to learn quickly.

   Then walk it

   1. Lead with the feedback loop, because that is the genuine structural difference from banking or research: your work is priced continuously and by someone who does not care about your reasoning.
   2. Then the second real difference: markets is a flow business, so the value you add is in pricing, liquidity and relationships, not in a document. Say you prefer being judged on decisions than on deliverables — and mean it, because it also means being wrong in public.
   3. Then be specific about which part of markets, because sales and trading is three jobs. Say whether you are drawn to market making, to a client-facing sales seat, or to a structuring or strat role, and give a reason rooted in something you have done.
   4. Then the evidence. Trading your own account is fine if you talk about process and risk rather than returns. A trading competition, a research project on market microstructure, or a market-making simulation all work. What is being tested is whether you have ever made a decision under uncertainty and reviewed it honestly.
   5. Then acknowledge the cost, because it is a job with real drawbacks: the hours are front-loaded around the open, the electronification of flow means the seat looks different from ten years ago, and a bad run is visible to everyone. Saying you know that is more convincing than enthusiasm.
   6. Close on why this firm's markets business rather than any other. Something concrete about their franchise — a product they are genuinely strong in, the structure of their graduate rotation — not a line from the careers page.

   Where candidates lose it

   Reciting 'fast-paced environment' and 'I love markets'. Both are unfalsifiable. The answer that works names the feedback loop as the reason, picks which of the three sales and trading jobs you want, and gives one piece of evidence with a process described rather than a return quoted.

   Expect next

   • Sales or trading, and why?
   • How has electronification changed the job you are applying for?
   • Tell me about a decision you made under uncertainty and how you reviewed it.

   Reported by candidates at Morgan Stanley (Global Markets, London, 2024). Source: Wall Street Oasis.

9. 094Which divisions sit inside sales and trading, and what does each one do?FitCorephone / first roundMSMorgan StanleyGlobal Markets · London · 2024

   Say this

   Broadly two halves: equities and fixed income, currencies and commodities. Within each you have sales, which covers clients, trading, which prices and warehouses risk, and structuring or strats, which builds the products and models. Then the cross-cutting businesses: prime brokerage, research, and electronic or systematic market making.

   Then walk it

   1. Equities: cash equities, equity derivatives — flow options and structured — delta one and swaps, convertibles, and prime brokerage sitting alongside as the financing business for hedge funds.
   2. FICC: rates, meaning government bonds and swaps; credit, both cash and CDS; foreign exchange, spot, forwards and options; commodities; emerging markets, which is often organised as its own cross-product desk; and securitised products.
   3. The functional split inside each desk: sales owns the client relationship and distributes ideas and axes, trading prices and manages the resulting risk, and structurers and strats build bespoke products and the pricing infrastructure. In electronic businesses the quant developers are effectively the traders.
   4. The distinction worth making, because it shows you understand the modern business: flow trading is a spread and market-share business that is increasingly automated, while structured and exotic trading is about warehousing risk you cannot hedge perfectly. Those are different skills and different career paths.
   5. Then say where you want to sit and why, in one sentence. That converts a list into an answer. 'I want flow equity derivatives because the pricing is quantitative and the client dialogue is real, and I would rather learn in a business with high ticket volume.'
   6. And show you know the boundaries: research is separate and walled from trading, prime brokerage is a financing business not a trading one, and treasury or the XVA desk are internal-facing rather than client-facing. Getting those boundaries right is the detail that signals you actually researched the firm.

   Where candidates lose it

   Giving a vague two-line answer, or naming desks without saying what they actually do. This is a homework question and a wrong answer says you did not do the homework. Finish by naming the desk you want and why, because a list with no preference reads as indifference.

   Expect next

   • Which of those desks do you want, and why?
   • How is flow trading different from exotics?
   • Where does prime brokerage sit and why is it not a trading business?

   Reported by candidates at Morgan Stanley (Global Markets, London, 2024). Source: Wall Street Oasis.

10. 095Tell me about something that is not on your resume.FitCoresuperdayUBSSales and Trading · New York · 2026

    Say this

    Pick one real thing you do outside work that you are genuinely good at, and talk about the part of it that reveals how you think. Not a hobby list — one thing, with enough specificity that it could not be anyone else's answer, and a connection to judgement under uncertainty that you do not have to force.

    Then walk it

    1. Choose something with depth rather than breadth. Competitive chess, cooking seriously, running a small resale business, rebuilding motorcycles, playing in a band, coaching a junior team. Depth in one thing beats a list of five.
    2. Lead with a specific detail rather than a category. 'I have been repairing and reselling film cameras for four years, about 200 of them' tells them something. 'I like photography' tells them nothing.
    3. Then the part that reveals process. What did you get wrong at first, what did you change, and what is the thing you now know that most people doing it do not? That is the same shape as a good trade review.
    4. Connect it lightly, once. If the resale business taught you about pricing and inventory risk, say so in one sentence. Do not construct an elaborate metaphor to trading — the forced version is worse than no connection at all.
    5. Keep it 60 to 90 seconds and leave a hook so they can ask about it. This question exists partly to see whether the interviewer wants to sit next to you for ten hours a day, so being interesting matters more than being impressive.
    6. And the mistake to avoid: do not use it to smuggle in another achievement. If the answer is 'I taught myself Python and built a backtester', that belongs on the resume, and saying it here suggests you either did not hear the question or have nothing outside work.

    Where candidates lose it

    Turning it into another achievement story, or listing hobbies. The question is asked to find a person, and the answer that fails is the one that is still selling. Pick one real thing, give a number or a specific detail, and let it be about you rather than about the job.

    Expect next

    • What did you get wrong when you started?
    • What do you know about that which most people don't?
    • What do you do when you are not working or studying?

    Reported by candidates at UBS (Sales and Trading, New York, 2026). Source: Wall Street Oasis.

Firm tags come from public, anonymous candidate reports on Wall Street Oasis: strong signal, not sworn testimony. Firms are named as the places a question was reported, not as partners of Fin Maverick. Answers are written for this page to show how to think out loud; they are not scripts to recite.