📚 PASS Research Analyst Certification Examination Difficulty: Beginner ℹ️ Info   ~5 min read
📌 Chapter 12.3 — Risks in Investments

Imagine you are presenting a model to an investment committee. You have identified a high-growth technology stock that looks undervalued based on your DCF analysis, but your senior mentor asks, ‘How does adding this stock to our existing Nifty 50-heavy portfolio affect the overall risk-adjusted return?’ This question shifts your focus from the individual security to the broader implications of Modern Portfolio Theory (MPT).

Developed by Harry Markowitz, MPT posits that an investment’s risk and return should not be viewed in isolation, but by how it contributes to the overall portfolio’s risk and return characteristics.

At its core, MPT suggests that by combining assets that are not perfectly correlated, an investor can significantly reduce unsystematic risk. In the Indian context, this means that while a specific pharmaceutical firm might face regulatory headwinds—an unsystematic risk—its performance may be uncorrelated with an FMCG or IT company in the same portfolio.

By quantifying the covariance between asset returns, you can construct an ’efficient frontier,’ representing the set of portfolios that offer the highest expected return for a defined level of risk. This is the cornerstone of professional asset allocation.

In your valuation work, applying MPT changes your recommendation logic. You are no longer just looking for the ‘best’ company, but the best ‘addition’ to a portfolio. If your analysis shows that two stocks in your watch list move in perfect lockstep, adding both provides little diversification benefit despite the effort spent analyzing them. Instead, a strategist seeks assets with low or negative correlation to existing holdings. This process allows you to maintain a targeted return profile while suppressing the volatility associated with individual firm-specific shocks.

Consider an analyst managing a portfolio focused on domestic consumption. If they add an export-oriented IT service firm, they are using MPT principles to hedge against a potential slowdown in Indian rural demand. The IT firm, with its revenue linked to global currency movements and international demand, acts as a shock absorber. When you justify a recommendation to a client, you are essentially explaining how the new asset’s unique risk-return profile complements their current holdings, rather than merely stating the stock is ‘cheap’ or ‘undervalued.’1

Nuance

⚠️ Nuance
Candidates often mistakenly believe MPT is solely about maximizing returns, leading them to confuse the ‘Efficient Frontier’ with a list of high-growth stocks. In reality, the Frontier is about optimization; it defines the mathematical boundary where no additional return can be gained without accepting more risk. A professional analyst must remember that even if a portfolio is ’efficient’ under MPT, it remains exposed to systematic risk that cannot be diversified away.

Check Your Understanding

Practice Question 1

An analyst is evaluating the inclusion of a new gold mining stock into a client’s portfolio of Indian banking stocks. Based on Modern Portfolio Theory, which factor is most critical to evaluate the impact of this addition?

Practice Question 2

Which of the following statements regarding the ‘Efficient Frontier’ is true according to Modern Portfolio Theory?

This is a companion read for Section 12.3 — Risks in Investments from PASS Research Analyst Certification Examination by Akhilesh Gururani, available on Amazon Kindle.

Copyright © 2026 Akhilesh Gururani. All rights reserved.

  1. Covariance measures the directional relationship between the returns of two assets, which is essential to calculating the portfolio variance in MPT. ↩︎