Active Equity Investing: Portfolio Construction for CFA Level III

What this chapter covers

Active Equity Investing: Portfolio Construction: topics in the order to study them

1. 1Active Share and Active Management FrameworkIt sets the vocabulary of benchmark, active weights, active share and tracking risk that every later topic uses.
2. 2Fundamental Law of Active ManagementIt turns skill and breadth into expected active return and risk, so you can test whether a strategy is worth running.
3. 3Equity Investment Styles and ApproachesYou need to know what each style tends to hold and how it behaves before you choose how to build a portfolio around it.
4. 4Portfolio Construction Approaches and WeightingIt puts the style into practice through replication, optimisation, factor and weighting choices, and shows their trade-offs.
5. 5Managing Risk Budgets and Portfolio ConstraintsOnce you can build a portfolio, you learn to limit it with risk budgets and constraints that match the client mandate.
6. 6Manager Selection and Combining StrategiesIt scales the ideas up from one portfolio to several managers or strategies, using what you learned about style and risk.
7. 7Trading, Rebalancing and Implementation CostsIt closes the loop by showing how costs and rebalancing rules reduce or protect the value you planned to add.

How to prepare Active Equity Investing: Portfolio Construction

1. Read the chapter once in study order and write a one-line definition of each key term, such as active share, tracking risk, information ratio, transfer coefficient and risk budget.
2. Memorise the core relationships and practise each by hand: active share from weight differences, the fundamental law with its inputs, and the link between active return, tracking risk and the information ratio.
3. Build a comparison sheet for styles and construction approaches: what each holds, when it works, what it costs and which client it suits.
4. Practise item sets by reading the vignette for client objectives and constraints first, then choosing the option that fits them, not just the one that is generally true.
5. Practise essay answers using the command word. For calculate, show the formula, inputs and result. For justify or recommend, give the decision and one or two reasons linked to the case facts.
6. Finish with mixed questions that combine topics, for example a risk budget breach followed by a rebalancing choice, and review every error by its cause: formula, concept or misreading.

Common mistakes in Active Equity Investing: Portfolio Construction

• Confusing active share with tracking risk

  Fix: Remember that active share is about holdings and weights, while tracking risk is about the volatility of returns relative to the benchmark.

• Applying the fundamental law without considering constraints

  Fix: Ask whether the mandate has limits like long-only or position caps. If it does, expect lower realised value added than the unconstrained result.

• Choosing a style or approach in the abstract instead of for the client

  Fix: Underline the client's return goal, risk tolerance, horizon, costs and restrictions first, then pick the option that fits them.

• Giving an essay answer that lists facts without answering the command word

  Fix: Read the bold command word. Calculate means show a number, justify means give a reason, and recommend means state a decision first.

• Treating risk budgets as simple allocations of capital

  Fix: Allocate and monitor risk contributions, since a small capital weight in a volatile or highly active strategy can use a large part of the budget.

• Ignoring implementation costs when judging a strategy

  Fix: Net the explicit and implicit costs against expected value added, and consider turnover, liquidity and rebalancing frequency before concluding.

Last-day revision: Active Equity Investing: Portfolio Construction

• ✓Active share measures the portion of the portfolio that differs from the benchmark; tracking risk measures the volatility of active returns.
• ✓Higher active share with high tracking risk points to a more concentrated, stock-picking approach; low values point to closet indexing.
• ✓Information ratio = expected active return ÷ active risk.
• ✓Fundamental law: expected active return depends on the information coefficient, breadth and active risk, scaled by the transfer coefficient when constraints reduce implementation.
• ✓Constraints such as long-only rules lower the transfer coefficient and so reduce realised value added.
• ✓Match style to client: value, growth, GARP, quality and momentum differ in holdings, risk and market conditions.
• ✓Equal weighting tilts toward smaller stocks and value; market-cap weighting is the neutral, benchmark-like approach, but it overweights stocks that have risen in price, so it can hold overvalued stocks.
• ✓Risk budgeting allocates total active risk across managers, strategies or bets, and should reflect where you have skill.
• ✓Core-satellite keeps a low-cost core and adds higher-conviction active satellites.
• ✓Implementation shortfall captures explicit costs, market impact and delay or opportunity cost.
• ✓Rebalancing trades off tracking error drift against transaction costs; wider ranges mean fewer trades but more drift.
• ✓Always tie the answer to the client's objectives and constraints.

Active Equity Investing: Portfolio Construction in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

• CFA Level IIAnalysis of Active Portfolio Management
• FRM Part IIVaR and Risk Budgeting in Investment Management
• CS ProfessionalNegotiation Skills and Communication
• CA FoundationPermutations and Combinations