Equity long/short is the classic hedge fund strategy and still one of the most common. The idea is simple: buy the stocks you expect to do well, and bet against the stocks you expect to do badly. If the manager is right on both sides, the fund can make money whether the market rises or falls.
If you work in fund administration, investor relations or on an allocator's team, you will see long/short equity funds described by their exposure: how much they hold long, how much short, and what that means for the fund's sensitivity to the market. This lesson explains what those numbers mean, shows how to calculate them, and describes the main variations of the strategy.
Long and short positions
A long position is the ordinary kind of investment: the fund buys shares and profits if the price rises. The most it can lose is what it paid.
A short position is the reverse. The fund borrows shares, usually through its prime broker, and sells them, hoping to buy them back later at a lower price and return them to the lender. This is called short selling. If the price falls, the fund keeps the difference as profit. If the price rises, the fund loses money. Lesson 3.2 (Short selling, leverage and prime brokerage) covers the mechanics step by step.
An equity long/short fund combines the two. Take the Kessling Harbor Equity Long/Short Fund, managed by Kessling Harbor Capital. Its analysts research companies and sort them into three groups:
- Longs: companies they think are undervalued or will beat expectations, such as a fictional software company, Brightwater Systems.
- Shorts: companies they think are overvalued or will disappoint, such as a fictional retailer, Pellham Stores, whose sales are shrinking.
- Everything else: companies with no strong view either way, which the fund does not hold.
Some short positions are not views on single companies. A fund may also short a stock index future or an exchange-traded fund to reduce its overall market exposure. This is sometimes called an index hedge or a macro hedge.
Gross and net exposure
Two numbers summarize the shape of a long/short portfolio. Both are measured against the fund's capital, which is the investors' money in the fund (its net asset value).
- Gross exposure = (longs + shorts) ÷ capital. It shows how much the fund has at work in the market in total, on both sides.
- Net exposure = (longs − shorts) ÷ capital. It shows how much of the fund is exposed to the direction of the market.
Kessling Harbor's fund has $100m of capital, $120m of long positions and $80m of short positions.
| Item | Working | Result |
|---|---|---|
| Capital | Given | $100m |
| Long positions | Given | $120m |
| Short positions | Given | $80m |
| Gross exposure | (120 + 80) ÷ 100 | 200% |
| Net exposure | (120 − 80) ÷ 100 | +40% |
How can a fund with $100m hold $200m of positions? Short selling brings in cash from the sale, and the prime broker lends against the portfolio. That use of borrowed money and short-sale proceeds is a form of leverage, which Lesson 3.2 explains. A gross exposure above 100% is a quick sign that a fund is using some leverage.
Some other points to keep in mind:
- Net exposure can be negative. If shorts are larger than longs, the fund is net short and tends to gain when the market falls.
- Exposures move every day. They are based on market values, so they change even if the manager trades nothing. Illustratively, if Kessling Harbor's longs rise 10% while its shorts stay flat, the longs grow to $132m and capital to $112m: net exposure rises from 40% to (132 − 80) ÷ 112 ≈ 46%, but gross exposure falls from 200% to (132 + 80) ÷ 112 ≈ 189%, because capital grew too.
- Reporting varies. Many funds show exposure by sector and country in their monthly reports. Some also report beta-adjusted net exposure, which allows for the fact that some stocks tend to move more than the market and others less. Always check which basis a figure uses.
Where the returns come from: alpha and beta
A long/short fund's return has two broad sources.
Beta is the return that comes from being exposed to the market's direction. A fund with +40% net exposure behaves, very roughly, like a fund with 40% of its capital in the market. When stocks in general go up, it tends to gain; when they fall, it tends to lose.
Alpha is the return that comes from security selection: picking longs that do better than the market and shorts that do worse. This is the skill investors are paying a hedge fund manager for. Lesson 4.2 shows how alpha and beta are measured.
The following example is illustrative. Suppose every stock the Kessling Harbor fund holds, long and short, moves exactly with the market, and the market falls 10%.
| Position | Size | Move | Profit or loss |
|---|---|---|---|
| Longs | $120m | −10% | −$12m |
| Shorts | $80m | −10% (a gain for the short seller) | +$8m |
| Total | −$4m, or −4% of capital |
The fund loses 4%, which is its +40% net exposure times the 10% market fall. That is pure beta: no stock picking involved.
Now suppose instead the market is flat, but the manager's picks are good: the longs rise 5% and the shorts fall 5%.
| Position | Size | Move | Profit or loss |
|---|---|---|---|
| Longs | $120m | +5% | +$6m |
| Shorts | $80m | −5% | +$4m |
| Total | +$10m, or +10% of capital |
That 10% is alpha. Both sides made money, and neither depended on the market's direction. In practice, returns are a mix of the two, and the manager's net exposure decides how much beta the fund carries.
Variations on the strategy
Long/short funds differ mainly in how much net exposure they run and how widely they invest.
| Variation | Typical net exposure | What drives returns |
|---|---|---|
| Long-biased | Clearly positive | A mix of market direction and stock selection |
| Variable net | Changes with the manager's market view | Stock selection plus timing of market exposure |
| Market-neutral | Close to zero | Mainly stock selection |
| Short-biased | Negative | Finding overvalued or failing companies |
Market-neutral funds aim to keep net exposure near zero, and often also balance their longs and shorts by sector, country and company size. The goal is a return that depends on stock selection and very little on the market. Because each position's expected gain is small once the market effect is removed, these funds often run high gross exposure.
Sector funds specialize in one industry, such as technology, healthcare, financials or energy. The manager's edge is deep knowledge of a smaller set of companies. A sector fund's returns can move strongly with its sector, even if its net exposure to the overall market is modest.
These labels describe tendencies rather than fixed rules. A fund's offering documents and monthly reports show the ranges it actually works within.
The risks on the short side
Shorting is not simply buying in reverse. It carries its own risks, which Lesson 3.2 covers in more depth.
- Losses are theoretically unlimited. A share price can only fall to zero, so a long position can lose at most 100%. There is no ceiling on how high a price can rise, so a short position has no ceiling on its loss.
- Borrow costs. The fund pays a fee to borrow the shares it sells. For most large companies the fee is small, but shares that are hard to borrow can be expensive.
- Recalls. The lender can ask for its shares back, which may force the fund to close the position at a bad time.
- Short squeezes. When a heavily shorted stock rises sharply, short sellers rush to buy back shares to limit their losses. That buying pushes the price higher still.
Because a losing short grows as a share of the portfolio while a losing long shrinks, managers commonly keep individual short positions smaller than their longs and watch them closely.
Key terms
- Long position: owning an asset, which gains if its price rises.
- Short selling: borrowing shares and selling them, aiming to buy them back later at a lower price.
- Gross exposure: (longs + shorts) ÷ capital; the total size of positions relative to the fund's capital.
- Net exposure: (longs − shorts) ÷ capital; the fund's sensitivity to the market's direction.
- Alpha: return from security selection, beyond what market exposure explains.
- Beta: return from exposure to the market's direction.
- Market-neutral: a strategy that keeps net exposure close to zero so returns depend mainly on stock selection.
- Short squeeze: a sharp price rise driven by short sellers buying back shares to close their positions.
Key takeaways
- Equity long/short funds buy stocks they expect to rise and short stocks they expect to fall.
- Gross exposure adds longs and shorts; net exposure subtracts shorts from longs. With $100m of capital, $120m long and $80m short, gross is 200% and net is +40%.
- Net exposure drives how much a fund moves with the market (beta); good stock picks on both sides produce alpha.
- Market-neutral funds keep net exposure near zero, and sector funds focus on one industry.
- Short positions carry extra risks: unlimited potential losses, borrow costs, recalls and squeezes.
This lesson is for educational purposes only and is not investment advice.