Portfolio Management Pathway · Active Equity Investing: Portfolio Construction

Core-Satellite Approach and Manager Selection for CFA Level III

Updated 8 October 2026 · Fact-checked

Manager selection and combining strategies means building a portfolio from several active and passive equity managers. In a core-satellite structure, a low-cost passive or low-risk core holds most assets and active satellites add alpha. You solve questions by checking manager fit, fees, and how much active risk each manager adds to the total.

Understand Manager Selection and Combining Strategies

Start with the problem. One active manager has one style, one set of biases and one chance of being wrong. A client who hires a single manager carries all of that manager's active risk. Combining managers spreads that risk.

The core-satellite approach splits the equity portfolio in two. The core is usually passive or enhanced indexed. It gives low-cost market exposure and low tracking error. The satellites are active managers, often with higher active risk, who are expected to earn alpha above their fees. The core sets a floor on cost. The satellites carry the active bets.

When you combine managers, what matters is correlation of active returns, not of total returns. Two growth managers may have different holdings yet share the same style bias, so their active returns move together and there is little diversification of active risk. Pair managers with different styles, or with low correlation of active returns, to lower total tracking error for the same expected alpha.

Manager selection starts with fit. Does the manager's process, style and benchmark match what the client needs? Look at the investment philosophy, consistency of process, style drift, active share, capacity and team stability. Past returns alone are weak evidence. Then look at fees. Fees reduce the alpha the client keeps, so judge managers on expected alpha net of fees per unit of active risk.

Fee structures matter too. A fixed (ad valorem) fee is a percentage of assets and is paid whatever the result. A performance-based fee pays more when returns beat a benchmark or hurdle. Features such as a hurdle rate, a high-water mark and a cap shape incentives. A performance fee with no cap or high-water mark can encourage excess risk-taking. Always compare fees after expected performance, using net-of-fee numbers.

Key rules to remember

Active return: Active return = Portfolio return − Benchmark return; Use for each manager and for the total portfolio. Diversification is judged on this series.
Tracking error (active risk): TE = standard deviation of active returns; Annualize consistently. It measures how far a portfolio's return strays from its benchmark.
Two-manager active risk: TE_p = √(w1² × TE1² + w2² × TE2² + 2 × w1 × w2 × ρ × TE1 × TE2); ρ is the correlation of the two managers' active returns. Lower ρ means more diversification of active risk.
Portfolio active return: α_p = w1 × α1 + w2 × α2; Weights apply to expected active returns, usually net of fees.
Information ratio: IR = Active return ÷ Tracking error; Use net-of-fee active return to compare managers or combinations.
Net alpha after fees: Net alpha = Gross alpha − Management fee − Performance fee; Compute the performance fee on the stated base, such as the excess over a hurdle.

How to solve Manager Selection and Combining Strategies questions

Use this order for any question on selecting or combining active equity managers. Tie each choice back to the client's objectives and constraints.

1Read the client's objective: return target, tracking error limit, cost sensitivity, and any constraints such as governance or liquidity.
2Decide the structure. A tight tracking error limit or high cost sensitivity points to a larger core. A higher active risk budget allows bigger satellites.
3Check manager fit: philosophy, style, benchmark match, active share, process consistency, style drift, capacity and team.
4Compute net-of-fee expected alpha and the information ratio for each candidate. Show every calculation.
5Assess diversification of active risk using correlation of active returns and style differences. Use the two-manager formula if numbers are given.
6Compare total tracking error and net alpha against the client's limits and choose the best fit.
7State the recommendation in one sentence and give the fewest reasons that earn the points, using the command word asked.

Quickest way: Fit, fee, correlation check

When to use it: Use when the question asks which manager to add or whether a combination meets a tracking error limit, and time is short.

Eliminate managers whose style or benchmark does not match the mandate.
Convert each remaining manager to net alpha and information ratio.
Prefer the manager with the lowest correlation of active returns to the existing managers, unless net alpha is clearly worse.
Check total tracking error against the limit, then write the answer with one number and one reason.

Common mistakes in Manager Selection and Combining Strategies

Judging diversification by correlation of total returns
Total returns of equity managers are all highly correlated with the market, so the number looks like the right one to use.
Fix: Use correlation of active returns versus the benchmark. That is what drives tracking error of the combination.
Ignoring fees when ranking managers
Candidates compare gross alpha because it is the number given first.
Fix: Subtract all fees before computing the information ratio or comparing managers.
Assuming more managers always lowers active risk
Diversification feels like a rule that always applies.
Fix: Managers with similar styles have high active return correlation. Adding them can raise cost with little risk reduction, and the portfolio may drift toward the benchmark while paying active fees.
Calling any performance fee good because it aligns interests
The textbook benefit is remembered but not the conditions.
Fix: Check for a hurdle, high-water mark and cap. Without them, the fee can reward luck or excess risk-taking, and the client may pay performance fees again on gains that merely recover earlier losses.
Treating the core as having zero tracking error
Core is thought of as passive.
Fix: A core may be enhanced indexed or hold a low-risk active mandate, so it can carry some active risk. Read what the core is.
Writing long answers with no recommendation
Candidates list every factor they know.
Fix: Answer the command word. Give the choice first, then the reasons tied to the client's constraints.

Worked examples

Example 1

A client has a tracking error limit of 3.0% for its equity portfolio. It splits assets equally between Manager A (tracking error 4.0%) and Manager B (tracking error 5.0%). The correlation of their active returns is 0.20. Does the combination meet the limit?

Show the solution

Weights are 0.5 each.
w1² × TE1² = 0.25 × 16 = 4.00.
w2² × TE2² = 0.25 × 25 = 6.25.
Covariance term = 2 × 0.5 × 0.5 × 0.20 × 4.0 × 5.0 = 0.5 × 0.20 × 20 = 2.00.
Sum = 4.00 + 6.25 + 2.00 = 12.25.
TE = √12.25 = 3.5%.

Answer: Combined tracking error is 3.5%, which is above the 3.0% limit. The combination does not meet the limit, even though correlation is low. The client would need a larger passive core or lower-risk managers.

Example 2

A fund's gross alpha is 2.4% a year with tracking error of 4.0%. It charges a management fee of 0.50% of assets plus a performance fee of 15% of any return above the benchmark after the management fee. Calculate net alpha and the information ratio.

Show the solution

Alpha after management fee = 2.4% − 0.50% = 1.90%.
Performance fee = 15% × 1.90% = 0.285%.
Net alpha = 1.90% − 0.285% = 1.615%.
Information ratio = 1.615 ÷ 4.0 = 0.404.

Answer: Net alpha is about 1.62% and the information ratio is about 0.40.

Exam tips

For combination questions, show the full tracking error formula with numbers. A correct typed number earns full credit, but working protects you if a step is off.
Link the structure to the client. A cost-sensitive client with a low risk budget suggests a bigger core, and the answer should say so.
Read the command word in bold. Identify, Justify and Recommend ask for different lengths of answer.
In item sets, check whether fee numbers are gross or net before computing the information ratio.
Answer only the number of responses asked for, in the order given.

Manager Selection and Combining Strategies in other exams

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

Manager Selection and Combining Strategies: frequently asked questions

What is the core-satellite approach?

It splits a portfolio into a core of low-cost passive or low-risk holdings and satellites of active managers. The core provides market exposure cheaply. The satellites aim to add alpha above fees.

How do I judge whether two managers diversify each other?

Look at the correlation of their active returns, not total returns. A lower correlation, often from different styles, reduces the tracking error of the combination for the same expected alpha.

Why do fee structures matter in manager selection?

Fees reduce the alpha the client keeps, and performance fees affect manager incentives. Features like a hurdle, high-water mark and cap decide whether the fee rewards skill or risk-taking.

Do I need to memorize the two-manager tracking error formula?

Yes. It is a short calculation and you can be asked to apply it with given weights, tracking errors and correlation. Practice it until you can do it without a reference.