NISM Series XXI-B Short Notes – Part 8: Risk Management in Portfolio Management
This is Part 8 of our 10-part NISM XXI-B short notes series on PassNISM.in. This part covers Chapter 17 — Risk Management. Understanding risk is central to the entire NISM XXI-B exam and to the actual practice of portfolio management.
👉 Also Read: Part 7: Modern Portfolio Theory & CAPM | Free Mock Test
Chapter 17: Risk Management What is Risk?
Investment is intrinsically risky. Risk is defined as the uncertainty of outcomes — which can relate to the value of assets or the earnings they generate. Return is the reward for bearing risk. Different asset classes carry different types and levels of risk. Defining, identifying, and managing risk is therefore a core responsibility of every portfolio manager.
The Risk Management Process
- Setting Objectives – Define what level of risk is acceptable relative to return goals
- Identification of Risks – Recognize all types of risks present in the portfolio
- Analyzing Risks – Quantify and understand the potential impact of each risk
- Evaluation of Risk – Assess whether current risk levels are within tolerance
- Treatment of Risks – Decide how to handle each risk (reduce, transfer, accept)
- Control and Monitor – Continuously track risks and take corrective action when needed
Types of Risk Market Risk
Risk arising from macroeconomic factors that cause variability across asset classes and securities. Market risk affects all securities — it cannot be eliminated through diversification. It can only be managed through hedging instruments like options, futures, and swaps.
Non-Market Risk (Idiosyncratic / Unsystematic Risk)
Specific to individual companies, sectors, or instruments. These risks CAN be reduced through portfolio diversification across different investments.
Company-Specific Risk
Factors specific to a particular company. Divided into:
- Business Risk: Arising from the nature of the company's operations (sales volatility, operating leverage)
- Financial Risk: Arising from the company's use of debt financing
Liquidity Risk
Reflects the ease of converting an asset to cash at fair value. Measured by the bid-ask spread in the market — a lower bid-ask spread indicates higher liquidity and lower liquidity risk.
Operational Risk
Risk of potential losses due to inadequate or failed policies, processes, systems, or people — essentially the risk of internal failure or breakdown.
Regulatory Risk
Risk arising from changes in laws and regulations (by government or regulatory body) that increase compliance costs or alter the competitive landscape for investments.
Legal Risk
When a third party sues a company for breach of contract, resulting in potential loss to investors.
Geo-political Risk
Arises from political relations between countries, driven by geographic and economic factors — includes war, sanctions, trade disputes.
Currency Risk
Risk of adverse movements in exchange rates — primarily relevant for portfolios with international exposure.
Concentration Risk
Risk arising from lack of diversification in the portfolio. Over-exposure to any single security, sector, asset class, or geography creates concentration risk.
Measuring Market Risk — Beta
Beta (β) is the primary measure of market (systematic) risk. It measures how sensitive a security's returns are to movements in the overall market.
β = Covariance (Security, Market) / Variance (Market)
Portfolio managers must not only mitigate market risk but also adhere to the portfolio's risk objectives as defined in its risk framework.
Value at Risk (VaR)
VaR is a statistical measure of the estimated potential loss over a specified period, at a given confidence level, under a particular market condition. In simple terms, it answers: "What is the maximum loss I could face over a given time period, with X% probability?"
VaR is defined by three elements: (1) Time period, (2) Confidence level (probability), (3) Market condition assumed
Three Methods to Calculate VaR
| Method | How It Works |
|---|---|
| Parametric Method | Assumes returns follow a normal distribution. Uses mean and standard deviation to calculate VaR analytically. |
| Historical Simulation | Uses actual historical return data to simulate potential losses. No distributional assumption needed. |
| Monte Carlo Simulation | Generates thousands of random return scenarios using statistical models to estimate potential losses. |
Risk Sensitivity Measures
Portfolio sensitivity to changes in underlying risk factors is measured by:
| Measure | Used For | What It Captures |
|---|---|---|
| Beta (β) | Equity portfolios | Sensitivity to market (index) movements |
| Duration | Bond portfolios | Sensitivity to interest rate changes |
| Delta (Δ) | Options-based portfolios | First-order sensitivity to underlying price changes |
| Gamma (Γ) | Options | Rate of change of delta with underlying price |
| Vega (ν) | Options | Sensitivity to changes in implied volatility |
Stress Testing
Stress tests assess extreme potential losses by either:
- Recreating a past negative market event (historical stress test)
- Creating a hypothetical extreme scenario
The goal is to prepare portfolio managers for sudden and large adverse market moves. Stress testing complements VaR by capturing tail risks — events that are unlikely but devastating if they occur.
Measuring Liquidity Risk
The most straightforward way to measure liquidity risk is the bid-ask spread. A wider bid-ask spread = lower liquidity = higher liquidity risk.
Measuring Credit Risk
Credit risk measurement involves three components:
- Probability of Default (PD): How likely is the borrower to default?
- Exposure at Default (EAD): How much is owed at the time of default?
- Loss Given Default (LGD): How much will actually be lost after recovery?
Expected Credit Loss = PD × EAD × LGD
Managing Risk Treatment of Risk
Options for treating identified risks:
- Avoidance – Don't take on the risk (don't invest in that asset/sector)
- Reduction – Diversify; use hedging instruments
- Transfer – Use insurance, derivatives, or credit guarantees
- Acceptance – Accept the risk within defined tolerance limits
Control and Monitor
Risk management is not a one-time exercise. Portfolios must be continuously monitored and risk exposures regularly re-assessed to ensure they remain within defined limits. Market conditions change — and so does the risk profile of a portfolio.
Quick Revision Box – Part 8
- Risk = uncertainty of outcomes; Return = reward for taking risk
- Market risk cannot be diversified away; Non-market risk can
- Liquidity risk is measured by bid-ask spread (wider = higher risk)
- VaR = max potential loss over a given period at a specified confidence level
- Three VaR methods: Parametric, Historical Simulation, Monte Carlo
- Credit risk = PD × EAD × LGD
- Beta = equity sensitivity; Duration = bond sensitivity; Delta = option sensitivity
- Stress testing captures tail risks that VaR may miss
👉 Continue Reading: Part 9: Equity & Fixed Income Portfolio Management Strategies
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