How do you construct a market-neutral equity portfolio and what risks remain?

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AcadiFi · Accepted Answer

A market-neutral portfolio targets zero systematic (market) exposure by balancing long and short positions so that the p...

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**Construction methods:**

**Dollar-neutral:** Equal dollar amounts long and short (e.g., $100M long, $100M short). Simple but doesn't ensure beta neutrality if the long and short books have different betas.

**Beta-neutral:** Adjust position sizes so weighted beta of longs equals weighted beta of shorts.

Example: Long book beta = 1.2, Short book beta = 0.8
To be beta-neutral with $100M long: Short $100M x (1.2/0.8) = $150M

**Factor-neutral:** Neutralize exposure to multiple factors (market, size, value, momentum) to isolate pure stock selection skill.

**Example -- Ridgeline Capital market-neutral fund (fictional):**

| Position | Weight | Beta | Weighted Beta |
|---|---|---|---|
| Long: Apex Semiconductor | +15% | 1.4 | +0.21 |
| Long: Clearpoint Health | +20% | 0.9 | +0.18 |
| Long: Driftwood Energy | +15% | 1.1 | +0.165 |
| Short: Foxglove Tech | -18% | 1.3 | -0.234 |
| Short: Glenmore Retail | -17% | 1.0 | -0.17 |
| Short: Hawthorne Media | -15% | 1.1 | -0.165 |
| **Net Portfolio Beta** | -- | -- | **-0.034 (approx 0)** |

**Residual risks that remain:**
1. **Stock-specific risk** -- Individual positions can have large losses
2. **Factor risk** -- Unintended exposure to size, value, or sector factors
3. **Liquidity risk** -- Short positions may face buy-in or borrow costs
4. **Crowding risk** -- Popular long/short names can move adversely when other funds unwind
5. **Leverage risk** -- Gross exposure (long + short) amplifies volatility

Market neutrality eliminates directional market risk but concentrates exposure on idiosyncratic stock selection. Poor stock picking in a market-neutral framework generates negative alpha with no market return cushion.

How do you construct a market-neutral equity portfolio and what risks remain?

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