Portfolio Management interview preparation

Questions

100

Traced to a firm

40

Firms

24

Updated

September 2026

Asked at

All firmsBLBlackRock4Vanguard4WMWellington Management4Amundi3ACAQR Capital Management3Neuberger Berman3SCSchroders3Man Group2MSCI2Northern Trust2AllianceBernstein1Apollo Global Management1Blackstone1BMBNY Mellon1Carlyle Group1Fidelity Investments1Goldman Sachs1Invesco1Millennium Management1MSMorgan Stanley1NUNuveen1PIMCO1SSState Street1TPTPG1

Topic

All topicsPortfolio theory5Factor models8Asset allocation11Rebalancing3Portfolio construction7Benchmarks and tracking error5Performance measurement8Risk management6Fixed income and LDI5Currency and global3Implementation and costs5Active versus passive6India markets7Brainteasers5Career and fit16

Level

AnyCoreIntermediateHard

Type

AnyTechnicalCaseMarket viewFitBrainteaser

1. 040What is the Sharpe ratio, and where does it mislead you?Performance measurementCorephone / first roundAsset management

   Say this

   Excess return over the risk-free rate divided by the volatility of that excess return. It is the standard measure of return per unit of total risk. It misleads whenever the return distribution is not symmetric, when returns are smoothed, or when the strategy sells tail risk.

   Then walk it

   1. Compute it on excess returns, not raw returns, and annualise properly: multiply the mean by the number of periods and the standard deviation by the square root of that number. A monthly Sharpe times twelve is wrong by a factor of about 3.5.
   2. Failure one, skew. A strategy that sells options or credit protection has a lovely Sharpe ratio right up to the day it does not. Volatility does not see the left tail, so option selling and carry trades look better than they are.
   3. Failure two, smoothing. Illiquid or appraisal-priced assets have autocorrelated returns, which suppresses measured volatility. A private credit fund reporting a Sharpe of 2 is often reporting the marking policy, not the risk. Correct for it by using the Lo adjustment or by summing lagged betas.
   4. Failure three, the horizon and the sample. Sharpe ratios are noisy: distinguishing a Sharpe of 0.5 from 1.0 with confidence takes many years of data, so ranking managers on three-year Sharpe is close to ranking noise.
   5. Failure four, it ignores whether the risk was systematic. A levered index fund has a decent Sharpe and no skill in it, which is why Sharpe is the wrong tool for evaluating an active manager inside a benchmarked mandate. Information ratio is the right one there.
   6. So I would quote Sharpe as a summary, then show Sortino for asymmetry, maximum drawdown for path, and the return distribution's skew and kurtosis. And if the assets are illiquid, I would say explicitly that the volatility is understated.

   Where candidates lose it

   Forgetting the risk-free rate in the numerator, or annualising by multiplying the ratio rather than scaling mean and standard deviation separately. On the substance, the failure interviewers most want to hear is that Sharpe rewards selling tail risk. A candidate who praises a hedge fund with a Sharpe of 3 and no questions about skew has failed the question.

   Expect next

   • How would you adjust Sharpe for illiquidity?
   • Sharpe or information ratio for an active equity manager?
   • What Sharpe ratio would make you suspicious?
2. 046Sharpe ratio or information ratio, which matters more for an active manager?Performance measurementCorephone / first roundAsset managementInstitutional asset management

   Say this

   Information ratio, if the manager has a benchmark. It measures excess return per unit of active risk, which is exactly what the client is paying for, whereas Sharpe includes the market exposure the client could have bought for a few basis points.

   Then walk it

   1. Definitions side by side: Sharpe is excess return over cash divided by total volatility. Information ratio is excess return over the benchmark divided by tracking error.
   2. The reason IR is the right one for a benchmarked mandate: a long-only equity manager's Sharpe is dominated by the equity risk premium, so in a good decade every manager looks skilled and in a bad one every manager looks useless. IR strips the market out.
   3. Typical scale is worth knowing so you can talk about it credibly. An IR of 0.5 over a full cycle is genuinely good and roughly top quartile, 0.75 is excellent, and anything above 1 sustained over a long period is rare and worth questioning.
   4. Sharpe is the right measure when there is no benchmark: absolute return funds, multi-asset total return, and anything where the client's alternative is cash.
   5. The connection to portfolio construction: IR is what the fundamental law predicts, skill times root breadth, and it is what a tracking error budget is denominated in. If I know a manager's IR I can say how much excess return I should expect for the tracking error I am giving them, which is the arithmetic of hiring them.
   6. The shared caveat: both are estimated from short samples and both are noisy, so I would look at IR alongside consistency, the proportion of rolling periods above benchmark, rather than treating a single point estimate as a fact.

   Where candidates lose it

   Treating them as interchangeable or picking Sharpe for a benchmarked fund. The decisive point is that Sharpe rewards market beta the client could buy for nothing. Also know realistic magnitudes; a candidate who says an IR of 3 is achievable has never looked at real manager data.

   Expect next

   • What information ratio would you expect from a good manager?
   • When is Sharpe the right measure?
   • How does IR link to the tracking error budget?

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.