What Is a Long-Short Equity Strategy? How Hedge Funds Use It

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A long-short equity strategy is an approach to stock investing that holds long positions in shares expected to rise (often judged undervalued) and short positions in shares expected to fall (often judged overvalued). Because the shorts offset part of the portfolio’s exposure to the overall market, returns depend more on picking the right stocks relative to each other than on the direction of the market as a whole. Hedge funds are the best-known users, but the same approach is also offered through mutual funds and ETFs that use shorting within regulatory limits.

How a Long-Short Equity Strategy Works

The manager builds two books. The long book holds stocks where research points to upside: cheap valuations, improving earnings, a catalyst. The short book holds stocks the manager expects to underperform. To short, the fund borrows shares, sells them, and later buys them back to return to the lender. It profits if the buyback price is lower than the sale price.

When a stock-specific view is right, both books earn money at once. When the whole market moves, gains on one side are partly cancelled by losses on the other. What remains is the spread between how the longs and shorts perform. This is the source of alpha the strategy is designed to capture.

Gross and net exposure

Two figures describe how a long-short portfolio is positioned:

• Gross exposure = (long market value + short market value) ÷ capital
• Net exposure = (long market value − short market value) ÷ capital

Hypothetical example: a fund with $100 million of capital holds $130 million of longs and $30 million of shorts. Gross exposure is 160% and net exposure is 100%. This is the classic 130/30 structure. It keeps full market exposure like a long-only fund, but uses the short proceeds and leverage to add 30% more long positions and express negative views on 30% worth of stocks.

Net exposure tells you how much the fund behaves like the market. A net figure near 100% means it will largely track the stock market’s direction. A net figure near zero means market moves matter much less. Gross exposure tells you how much leverage and stock-specific risk the fund is carrying. Two funds with the same 20% net exposure can have very different risk if one runs 60% gross and the other 250%.

How funds differ

Long-short equity managers differentiate along several lines:

• Geography: developed markets, emerging markets, a single region such as Europe.
• Sector: technology, energy, healthcare, biotech.
• Philosophy: value, growth, or quantitative and cross-sectional models that rank many stocks and go long the top and short the bottom.
• Bias: long-biased, variable net, or short-biased. Short-biased funds are rare, partly because profitable short ideas have historically been harder to find.

Example of a Long-Short Equity Strategy: The Pair Trade

A pair trade offsets a long position in one stock with a dollar-equal short in a related stock, usually in the same industry.

Hypothetical example. An investor buys 1,000 shares of Stock A at $33 ($33,000) and shorts 1,500 shares of Stock B at $22 ($33,000). The two positions have equal dollar value.

The trade still makes money in the second case because A outperformed B, even though both rose. It would lose if B outperformed A, regardless of whether the market rose or fell. The figures ignore borrowing fees, commissions and any dividends owed on the short.

Same-sector pairs hedge the sector, because related stocks tend to move together. That also limits how far the spread can move. Some managers instead pair different sectors to express a macro view. For example, if they expect rising interest rates, they might short rate-sensitive utilities and go long defensive healthcare names. That reintroduces sector risk in exchange for a larger potential spread.

Long-Short Equity vs. Equity Market Neutral

Equity market neutral (EMN) funds are a subset of long-short with a tighter rule: keep the long and short books roughly equal in value, so net exposure stays near zero. Positions are typically in closely related stocks with similar characteristics.

Holding that balance forces constant rebalancing. When a trend lifts the longs, the EMN fund trims winners and adds to the short side to restore equality, giving up some of the move. A directional long-short fund can let a winning trend run, raise its net exposure, or add leverage. EMN funds are often aimed at institutional investors seeking returns above bonds with lower volatility than aggressive equity funds. Risk-adjusted measures such as the Sharpe ratio are more meaningful than raw returns when comparing the two styles.

Limitations of a Long-Short Equity Strategy

• Short losses are open-ended. A long position can lose at most its cost. A short can lose more than its initial value if the stock keeps climbing. Crowded shorts can be hit by short squeezes.
• Carrying costs. Short sellers pay borrow fees, which can be high on hard-to-borrow stocks. They also owe the lender any dividends paid while the position is open.
• Both sides can be wrong. If longs fall while shorts rise, losses compound rather than offset.
• Hedges are imperfect. A short in a related stock does not cancel the risk of a long position exactly. Correlations can shift in stressed markets.
• Lagging in strong bull markets. The short book is a drag when nearly everything rises. A low-net fund will usually trail an index like the S&P 500 in those periods.
• Fees. Hedge fund versions often charge performance fees on top of management fees. This raises the bar the stock-picking spread must clear.

The Bottom Line

Investors weighing hedge funds, mutual funds or ETFs that short stocks should look at both net and gross exposure to judge market sensitivity and leverage. The strategy pays off only when the manager's longs beat the shorts by enough to cover borrow fees, dividends owed and management fees. In strong bull markets, low-net funds will usually lag a broad index.