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. 006You run a 50 million dollar equity portfolio with a beta of 1.2. Index futures are at 5,000 with a 50 dollar multiplier. Hedge it, and tell me what you are left with.Forwards and futuresHardtechnicalEquity derivativesAsset management

   Say this

   Short 240 contracts. One contract is 5,000 times 50, so 250,000 dollars of notional. You need beta times portfolio value of index exposure, which is 1.2 times 50 million, or 60 million, and 60 million divided by 250,000 is 240. What you are left with is the alpha, plus basis risk, plus the fact that beta is an estimate.

   Then walk it

   1. Contract notional first: 5,000 index points times the 50 dollar multiplier is 250,000 dollars per contract. Always state this before dividing, because it is where candidates drop a factor.
   2. Number of contracts equals beta times portfolio value over contract notional. 1.2 times 50 million is 60 million of index-equivalent exposure; divided by 250,000 that is 240 contracts, sold.
   3. Check the hedge does what you want. If the index falls 10 percent, your book falls about 6 million on a 1.2 beta, and the short 240 contracts gain 60 million times 10 percent, which is 6 million. Flat, by construction.
   4. The minimum-variance version is more honest than beta from a regression on the wrong window: h equals the correlation times the ratio of the standard deviations, which is the same thing as the slope of portfolio returns on futures returns. Estimate it on the horizon you actually intend to hedge.
   5. What remains: idiosyncratic return, which is the point if you think you can pick stocks. Plus basis risk between the futures and the cash index, dividend risk in the futures basis, and the cash drag of posting margin.
   6. And beta drifts. It is unstable across regimes and it rises in crashes, so the hedge that looks right in calm markets under-hedges in the event you bought it for. I would re-estimate and adjust rather than set it once.

   Where candidates lose it

   Forgetting the multiplier, or hedging notional rather than beta-adjusted notional. On a 1.2 beta portfolio, hedging 50 million instead of 60 leaves you a fifth under-hedged. Say the two-step — beta-adjust, then divide by contract notional — out loud so the interviewer can follow.

   Expect next

   • Would you use futures or buy puts, and how would you choose?
   • Your beta was estimated over three years. What if the market regime just changed?
   • What is left in the portfolio after the hedge, and is that what you wanted?
2. 007A refiner wants to hedge crude purchases for the next three years but only the front months are liquid. What do you do, and what could go wrong?Forwards and futuresHardcase studyCommodities tradingCorporate treasury

   Say this

   Stack the whole exposure in the liquid front contracts and roll it forward each month, or use a smaller strip out the curve and accept a partial hedge. Either way the thing that kills you is not price — it is the funding of variation margin on a position that is economically flat.

   Then walk it

   1. The stack-and-roll: put on the full three years of notional in the front two contracts, then roll month by month. You get liquidity and a tight bid-offer, but you take the roll basis twenty-plus times.
   2. The strip alternative: sell what you can in each maturity out to three years, accepting wide spreads and a smaller hedge ratio. Less basis risk, more transaction cost, and possibly no liquidity at all beyond eighteen months.
   3. The funding problem is the real answer. Your futures leg settles in cash daily. Your physical purchases happen over three years. If crude rallies, you fund margin calls today against a benefit that arrives in 2029.
   4. This is exactly what sank Metallgesellschaft in 1993. The hedges were economically sound, but the position was stacked in the front, the curve went from backwardation to contango, and the margin calls ran to over a billion dollars. They closed the hedges near the bottom.
   5. So the practical structure: size the stack to what you can fund under a stress scenario, arrange a committed credit line specifically for margin, and pre-agree with the board what a mark-to-market loss on a hedge means, so nobody panics at the wrong moment.
   6. I would also swap some of it into an OTC commodity swap with a bank. You give up the clearing-house credit protection and pay a wider spread, but the collateral terms are negotiable under a CSA, which is precisely the problem you are trying to solve.

   Where candidates lose it

   Answering only with the mechanics of stacking and rolling. The interviewer is fishing for the funding-liquidity failure — a perfect hedge that gets closed out because of a cash call. Name Metallgesellschaft or an equivalent, and say how you would size the position to survive it.

   Expect next

   • How would you size the position so a margin call cannot force you out?
   • Would you rather hedge with an OTC swap? What do you give up?
   • How do you explain a 200 million mark-to-market loss on a hedge to a CFO?
3. 010In April 2020 WTI settled at minus 37 dollars. How can a price be negative, and how does that break the models?Forwards and futuresHardsuperdayCommodities tradingClearing and risk

   Say this

   Because WTI is physically delivered at Cushing, and if every tank is full, taking delivery costs you money. A negative price is just storage scarcity expressed as a price: holders were paying to not receive barrels they had nowhere to put. It broke two things — models that assume lognormal prices, and margin systems built on percentage moves.

   Then walk it

   1. Mechanics first: the May contract required physical delivery at Cushing. Demand had collapsed, storage was effectively sold out, and long holders facing delivery with no tank had to pay someone to take the contract.
   2. So convenience yield went sharply negative. The carry identity still holds — it is the storage term that exploded, because the marginal unit of storage was unobtainable at any price.
   3. The modelling failure: lognormal price dynamics, which is what Black-Scholes and most commodity option models assume, put zero probability on a negative price. Every option model on the screen was undefined the moment the price crossed zero.
   4. The industry response was to shift crude options to the Bachelier model, where prices are normally distributed and can go negative, and to quote volatility in dollars rather than percent. Rates desks had already done this when European yields went negative in 2015.
   5. The clearing consequence was worse. Margin models scaled to percentage moves cannot size risk on a price near zero, and several brokers had systems that could not even represent a negative price. Retail products tracking the front contract — including a large Chinese bank's oil product — took catastrophic losses.
   6. The lesson I would draw is about the delivery mechanism rather than oil. A financially settled contract on the same underlying did not go negative in the same way. Physical delivery is what converts a full tank into a price, and any contract with physical settlement can do this.

   Where candidates lose it

   Treating it as a freak event with no lesson. The point is that the model assumption — prices cannot be negative — was an assumption, not a fact, and it was load-bearing in every option pricer and margin system. Name the switch from lognormal to Bachelier.

   Expect next

   • How do you price an option when the underlying can be negative?
   • Why did the financially settled contract behave differently?
   • What should a clearing house change after an event like that?

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.