How do equity market-neutral strategies actually achieve zero beta?

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AcadiFi · Accepted Answer

Equity market-neutral strategies target beta ≈ 0 through a combination of dollar neutrality, beta-weighted neutrality, and factor neutrality. Consider Stormcrest Neutral Partners managing $1.8B. Level one: dollar neutral. Longs equal shorts in dollar terms ($900M long, $900M short). This is necessary but not sufficient because beta varies across stocks. Level two: beta-weighted. Sum of (long weight × beta) = sum of (short weight × beta). If the long book has average beta 1.15 and shorts average 0.90, portfolio beta ≈ 0.25, not zero. Rebalance weights so the beta-weighted longs equal beta-weighted shorts. Level three: factor neutral. Use a risk model (Axioma, Northfield) to neutralize exposures to size, value, momentum, quality, and sector. If your longs skew to low-vol large-cap tech and shorts skew to high-beta small-cap financials, you have implicit factor bets that aren't market neutral. Stormcrest targets zero exposure on size, value, momentum, plus sector-neutral within 150 bps per GICS sector. Implementation: portfolio optimizer with constraints on 7-8 factors, 15-20 sector and country buckets, individual position limits (50-150 bps), and gross exposure cap (typically 3-4x net). Rebalance frequency: daily or every few days for high-frequency signals. Monitoring: realized beta over 20, 60, 120-day windows using OLS vs S&P 500. If rolling 60-day beta drifts outside -0.10 to +0.10, the optimizer is recalibrated. Execution costs matter: market-neutral funds trade 2-3x their AUM annually; transaction costs of 15-25 bps can halve gross alpha. Good funds deliver 4-7% net returns at 4-5% vol.

How do equity market-neutral strategies actually achieve zero beta?

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