What is the core-satellite approach and how do I determine the allocation split?

Question

AcadiFi · Accepted Answer

The core-satellite approach combines the cost efficiency of passive management with the alpha-generation potential of active management. The "core" is a broad market index, and "satellites" are concentrated active positions targeting specific opportunities.

```mermaid
pie title Core-Satellite Allocation Example
  "Core: Global Equity Index" : 45
  "Core: Aggregate Bond Index" : 20
  "Satellite: EM Small Cap" : 10
  "Satellite: Sector Rotation" : 8
  "Satellite: Real Estate" : 7
  "Satellite: Private Equity" : 5
  "Satellite: Hedge Fund" : 5
```

**The Framework:**

The core provides market beta (systematic return) at low cost, while satellites target alpha (excess return) in less efficient markets where active management has a higher probability of adding value.

**Worked Example — Whitmore Endowment ($200M):**

Whitmore's investment committee decides on a 65% core / 35% satellite split:

| Component | Allocation | Vehicle | Expected Return | Fee |
|---|---|---|---|---|
| **Core (65%)** | | | | |
| Global equity index | $90M (45%) | Vanguard Total World | 7.5% | 0.07% |
| US aggregate bond index | $40M (20%) | iShares Core Agg | 4.2% | 0.04% |
| **Satellites (35%)** | | | | |
| EM small cap | $20M (10%) | Ashford EM Fund | 10.5% | 1.20% |
| Sector rotation | $16M (8%) | Internal team | 9.0% | 0.50% |
| Private real estate | $14M (7%) | Oakmont REIT Fund | 8.0% | 0.85% |
| Private equity | $10M (5%) | Bridgeway PE VII | 12.0% | 1.50% |
| Hedge fund | $10M (5%) | Meridian Market Neutral | 6.5% | 1.25% |

**Blended expected return:** 0.45(7.5%) + 0.20(4.2%) + 0.10(10.5%) + 0.08(9.0%) + 0.07(8.0%) + 0.05(12.0%) + 0.05(6.5%) = **7.56%**

**Blended fee:** 0.45(0.07%) + 0.20(0.04%) + 0.10(1.20%) + 0.08(0.50%) + 0.07(0.85%) + 0.05(1.50%) + 0.05(1.25%) = **0.37%**

Compare: a pure active approach might have a blended fee of 0.80-1.20%, while pure passive would be 0.05-0.10%.

**Factors Driving the Core/Satellite Split:**

1. **Market efficiency beliefs:** If you believe large-cap US equities are highly efficient, allocate more to the passive core. Put active satellites in less efficient spaces (EM, small cap, alternatives).
2. **Risk budget:** Each satellite adds tracking error. The total active risk must stay within the investment committee's tolerance.
3. **Fee sensitivity:** Endowments and pensions with long horizons can tolerate illiquid satellites (PE, real estate) that may justify higher fees through illiquidity premium.
4. **Alpha confidence:** Only allocate to satellites where you have high conviction in manager skill. A mediocre active manager in an efficient market destroys value after fees.

**Comparison of Approaches:**

| Approach | Cost | Alpha Potential | Tracking Error | Complexity |
|---|---|---|---|---|
| Pure Passive | Very low | None | Zero | Low |
| Core-Satellite | Moderate | Moderate | Controlled | Medium |
| Pure Active | High | Highest (if skilled) | High | High |

**Why Core-Satellite Wins in Practice:**
- The core anchors the portfolio to the benchmark, preventing large underperformance.
- Satellites allow targeted bets without wagering the entire portfolio.
- Fee savings on the core fund the higher fees on satellites.
- It is easier to evaluate satellite manager performance in isolation.

**Exam Tip:** Constructed response questions may give you a client scenario and ask you to recommend a core-satellite structure. Justify each satellite with a reason (market inefficiency, illiquidity premium, diversification benefit) and ensure the total fee is reasonable.

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What is the core-satellite approach and how do I determine the allocation split?

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