A long/short fund holds $120M of tech longs against $60M of index shorts on $100M of capital. The market falls 20% and the fund loses 9.6%. Its beta alone implies a 19.2% loss. That gap only makes sense once you separate alpha from beta, and separating them is the whole point of equity hedge fund analysis.
Every equity hedge fund shares one core idea: buy stocks it judges undervalued and short stocks it judges overvalued. What separates one fund from another is the market exposure it intends to keep and its style tilt. Long/short funds usually maintain net long exposure, market-neutral funds target near-zero beta, and short-bias funds generally maintain net short exposure. Managers may employ leverage, but it is a choice, not a requirement. Success depends on longs beating shorts, not on longs rising and shorts falling in absolute terms.
Gross and net exposure define the shape of the book. A fund with $80 million long and $30 million short on $100 million capital:
Common mistakes
- Confusing dollar-neutral with market-neutral. Equal dollars long and short produce zero net dollar but can still carry meaningful beta. With each leg equal to 100% of NAV, longs averaging beta 1.3 against shorts averaging beta 0.7 leave 0.6 net beta, failing mean neutrality. Trap: answering "go dollar-neutral" when asked how to eliminate market risk.
- Treating significant alpha as proof of market inefficiency. Joint hypothesis: positive alpha could reflect genuine inefficiency OR a misspecified benchmark model. Trap: "the anomaly proves markets are inefficient." Wrong, name both possibilities, and consider sampling error or data mining as well.
- Confusing alpha shorts with market-based shorts. Alpha shorts and pair trades are single-stock shorts built on a company-specific view, and a pair also hedges the exposures its two stocks share. Market-based shorts are basket and index shorts that hedge factor exposure.
Bottom line
- Equity hedge funds go long undervalued and short overvalued stocks, differing in intended exposure: usually net long (long/short), beta near zero (market-neutral), generally net short (short-bias). Net dollars are not beta. Leverage is optional.
- Return decomposes into alpha, beta, and factor tilts, but whether factor returns count as alpha depends on the benchmark. Liquidity provision pays only when you separate temporary order pressure from fundamental news.
- Anomalies (accruals, momentum, earnings momentum, issuance, legal insider trading) are joint hypothesis tests, more credible when you can name who pays and why that counterparty trades.
- Six-month winners keep winning for 6, 12 months, but one-month and five-year winners reverse. PEAD is price drift after surprises, distinct from earnings momentum itself.
Exam shortcut
Single-stock vs market-based shorts: identify each short by what is shorted and how it is built, not by whether it hedges, since pairs and baskets hedge too. A named company shorted on a negative fundamental view is an alpha short. One stock sized against a long in a similar stock is a pair trade.
The full lesson (about 8,022 words, 53 min read) adds 2 worked examples, all 6 common mistakes, a self-check, free in the app.
Learning objectives
- distinguishing
- short selling
- arbitrage-free models
- returns allocation
- multistrategy
- research
- indices
- macro overview
- macro
- managed futures
- systematic trading
- trend following
- mf dimensions
- systematic construction
- mf benefits
- mf evidence
- mf fund benefits
- event sources
- activist investing
- activism outcomes
- merger arb
- distressed securities
- event multi special
- rv overview
- convertible arb overview
- convertible arb drivers
- vol arb overview
- vol arb strategies
- fi arb
- rv multistrategy
- equity commonalities
- sources of return
- market anomalies
- anomaly strategies
- equity shorts
- three strategies
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