What criteria should an analyst use when selecting sector ETFs for a top-down portfolio strategy?

Question

AcadiFi · Accepted Answer

Selecting sector ETFs requires a systematic framework that goes beyond just looking at expense ratios. Here is a structured approach for CFA-level analysis.

**Framework for Sector ETF Selection:**

```mermaid
flowchart TD
    A[Define Sector View] --> B[Screen Available ETFs]
    B --> C{Evaluate Structural Factors}
    C --> D[Index Methodology]
    C --> E[Expense Ratio]
    C --> F[Tracking Error]
    C --> G[Liquidity & AUM]
    D --> H{Compare Holdings}
    E --> H
    F --> H
    G --> H
    H --> I[Select Best Fit]
    I --> J[Monitor & Rebalance]
```

**1. Index Methodology:**
Not all "technology" ETFs track the same index. GICS vs. ICB classification differences can mean one ETF includes media companies while another does not. Check the underlying index rules.

**2. Expense Ratio:**
For passive sector exposure, costs matter enormously over time. A 0.10% vs. 0.45% annual fee on a $500,000 allocation costs $1,750 extra per year.

**3. Tracking Error:**
Low expense ratio means nothing if the ETF consistently deviates from its benchmark. Compare the annualized tracking error over 3+ years. Acceptable range is typically under 50 bps.

**4. Liquidity Metrics:**
- Average daily trading volume
- Bid-ask spread (tighter = cheaper to trade)
- AUM (larger funds generally have better liquidity and lower risk of closure)

**5. Holdings Concentration:**
Some sector ETFs are market-cap-weighted and thus heavily concentrated. A technology ETF might have 40% in just two mega-cap names, reducing diversification benefits.

**Example Comparison — Healthcare Sector:**

| Metric | ETF Alpha | ETF Beta |
|---|---|---|
| Expense ratio | 0.10% | 0.35% |
| Tracking error | 0.15% | 0.42% |
| AUM | $18B | $2.1B |
| Avg spread | 0.02% | 0.08% |
| Top 5 weight | 38% | 25% |

ETF Alpha wins on cost and liquidity; ETF Beta wins on diversification. The choice depends on whether concentration risk or cost is your binding constraint.

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What criteria should an analyst use when selecting sector ETFs for a top-down portfolio strategy?

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Metric	ETF Alpha	ETF Beta
Expense ratio	0.10%	0.35%
Tracking error	0.15%	0.42%
AUM	$18B	$2.1B
Avg spread	0.02%	0.08%
Top 5 weight	38%	25%