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. 063What are the components of transaction cost?Implementation and costsCorephone / first roundAsset managementPortfolio implementation

   Say this

   Explicit costs you can see on the ticket, commission, taxes, exchange fees, and implicit costs you have to measure, spread, market impact, delay and opportunity cost. The implicit ones are usually several times larger than the explicit ones, which is why cost control is a portfolio construction question.

   Then walk it

   1. Explicit: brokerage commission, exchange and clearing fees, and transaction taxes. In India that means STT, stamp duty and GST on brokerage, which together make high-turnover strategies structurally more expensive than in the US.
   2. Spread: you buy at the offer and sell at the bid, so half the spread each way is a cost even for a tiny order. In a liquid large cap that is a couple of basis points; in a small cap it can be 50.
   3. Market impact: your own order moves the price. It scales roughly with the square root of order size relative to average daily volume, so trading 20 percent of a day's volume is far more than four times as expensive as trading 5 percent.
   4. Delay and opportunity cost: the price drift between decision and execution, and the alpha lost on unexecuted quantity. These are invisible in a broker report and often the largest components for an active manager.
   5. Then the structural ones people forget: the cost of crossing the spread on the rebalance of an index at the reconstitution date, when everyone trades the same way at the same time, and the tax cost of realising gains in a taxable portfolio.
   6. Practically I would measure all of it as implementation shortfall against the decision price, break it down by strategy and market, and use it as an input to how fast and how often I am willing to trade. The right target is not zero cost, it is maximum alpha net of cost.

   Where candidates lose it

   Listing only commission and spread. Market impact and opportunity cost are the ones that matter, and the square root relationship between size and impact is the detail that shows you understand why capacity is limited. Giving Indian specifics, STT and stamp duty, is a cheap way to show you know the market you are being hired for.

   Expect next

   • How does impact scale with order size?
   • Which costs get worse in a stressed market?
   • How would you trade a large order in an illiquid stock?

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.