Equity Research interview preparation

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100

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72

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Updated

September 2026

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1. 067What is tracking error and how do you calculate it?Portfolio and riskIntermediatetechnicalMSCIFinancial Tools · Monterrey · 2013

   Say this

   The standard deviation of the difference between the portfolio's returns and the benchmark's. It measures how far a portfolio can drift from its index, and it is the budget within which an active manager operates.

   Then walk it

   1. Calculate the active return each period, portfolio minus benchmark, then take the standard deviation of that series, usually annualised.
   2. Ex-post tracking error uses realised returns. Ex-ante uses a risk model to forecast it from current holdings, which is what a risk system reports daily.
   3. Typical levels: an index fund runs a few basis points, an enhanced index strategy 1 to 2 percent, an active manager 4 to 8 percent, and a concentrated high-conviction fund can be well above that.
   4. It connects to the information ratio, which is active return divided by tracking error. That ratio, not raw outperformance, is how skill per unit of risk is judged.
   5. The main use is as a constraint: a mandate sets a tracking error budget, and the manager allocates it to the positions with the highest expected information ratio.
   6. The subtlety worth naming: tracking error is symmetric, so it penalises outperformance as well as underperformance. A manager can have excellent returns and breach a tracking error limit, which is why the constraint sometimes forces suboptimal decisions.

   Where candidates lose it

   Confusing it with volatility. Tracking error is the volatility of the difference, not of the portfolio. A low-volatility portfolio can have very high tracking error against a volatile index.

   Expect next

   • What is the information ratio?
   • What tracking error would you expect from a concentrated fund?
   • How does a tracking error budget change portfolio construction?

   Reported by candidates at MSCI (Financial Tools, Monterrey, 2013). 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.