Long / Short (Equity)
A strategy that takes long positions (betting a security rises) in names expected to outperform and short positions (betting a security falls) in names expected to underperform, often to reduce net market exposure while expressing stock-specific views.
Long / Short (Equity) · the mechanism
1 min read
Explain gross and net exposure, say where the return is supposed to come from, and size a pair trade.
Where it comes up. An allocator asks how much of last year came from stock selection and how much from being 70% net into a rising market.
Long the good, short the bad
The fund owns positions it expects to outperform and shorts positions it expects to underperform. The shorts are not only a hedge: they are meant to make money on their own, which is what separates the strategy from a long-only fund with a market hedge.
Read gross and net separately
Gross exposure is longs plus shorts and measures how much risk is on. Net is longs minus shorts and measures directional exposure to the market. A book at 150% gross and 20% net is taking a lot of single-stock risk and almost no market view. The two numbers answer different questions and quoting only one hides the other.
Understand where the return should come from
If the market rises and the book makes money, that could be beta and anyone can buy beta cheaply. The claim is alpha: that the longs beat the shorts regardless of direction. Which is why performance is examined by attribution, long book against short book, rather than by the headline number.
Know what the shorts cost
Shorting requires borrowing the stock, which has a fee that can be very large in a crowded name, and it exposes you to recall if the lender wants it back. Losses are unbounded, and a position that moves against you grows as a share of the book without you doing anything. This asymmetry is why short books are sized more tightly than long ones.
Worked through
A $100m fund with $110m of longs and $40m of shorts.
- Gross exposure
- ($110m + $40m) ÷ $100m = 150%
- Net exposure
- ($110m − $40m) ÷ $100m = 70%
- If the market falls 10% with no stock selection
- about −7% from beta alone
At 70% net this is still substantially a directional book. A market-neutral fund would run net close to zero, and its return would be entirely the spread between the two sides.
Check yourselfA fund returned 12% while the market returned 20%, running 60% net. Did it do well?
Answer once you have one →
Probably yes. At 60% net, market exposure alone would have delivered around 12%, so it roughly matched a much less risky passive alternative on the surface. The real question is the attribution: if the long book beat the market and the shorts lost less than the market rose, the manager added value on both sides in a very hostile environment for shorts. Judging a hedged book on its headline number against an unhedged index is the mistake.
Be able to say this back next week
- Quoted gross and net separately, and said what each one answers
- Said the shorts are meant to make money, not only to hedge
- Named the costs of shorting: borrow, recall, and unbounded loss
Why Long / Short (Equity) matters in interviews
Long/short equity is the strategy most hedge fund interviews are built around, and the question behind it is always the same: do you understand that a fund is paid for the part of a return the market did not give it? Anyone can be long in a rising market.
How it works in practice
The fund buys shares it expects to outperform and sells borrowed shares it expects to underperform, returning them later. Gross exposure is long plus short, and measures how much position is on. Net exposure is long minus short, and measures how much market risk the book is actually carrying.
A worked case: the book is 130/60 and the market falls 10%. A pure long-only fund at 100% net is down roughly 10%. This book, at 70% net, is down roughly 7% from market movement alone, and the difference between that and its actual return is what the manager is paid for. If the longs fall 8% while the shorts fall 15%, the fund makes money on the short leg and outperforms substantially.
Shorting costs money in ways that being long does not. You pay a borrow fee to the lender, which for a heavily shorted small cap can run to double digits annually; you owe any dividend paid while short; and losses are theoretically unlimited, because a share can rise without bound while it can only fall to zero. That asymmetry is why short books are more diversified and held on shorter leashes than long books.
Variants matter in interviews. Market neutral runs net exposure near zero and lives entirely on stock selection. Directional long/short runs a persistent net long, typically 40% to 70%, and accepts market exposure. Pair trading holds a long and a short in the same industry to isolate the relative call.
What candidates get wrong
- Confusing gross with net. Gross measures how hard the book is working and drives the borrow and financing cost; net measures how exposed it is to the market. A fund can be 300% gross and 0% net.
- Pitching a short as "an overvalued company". Overvalued is not a thesis: a stock can stay expensive for years. A short thesis needs a catalyst and a timeframe, because the borrow cost runs every day you wait.
- Ignoring the short squeeze. A crowded short in a small float can rise violently on good news as shorts cover into each other, which is why funds size shorts smaller than longs and watch days-to-cover.
- Assuming market neutral means low risk. It removes market direction and leaves concentrated stock-specific and factor risk, often at high gross exposure, which is a different risk rather than less of it.
Long / Short (Equity): frequently asked questions
What is a long/short equity strategy?
A hedge fund strategy that holds long positions in shares expected to rise and short positions in shares expected to fall. The short book offsets part of the market exposure of the long book, so returns depend more on which shares were picked than on whether the market went up. It is the most common equity hedge fund strategy and the one most fundamental hedge fund interviews assume.
What is the difference between gross and net exposure?
Gross exposure is long plus short as a percentage of capital, and measures how much total position the fund has on. Net exposure is long minus short, and measures how much market direction the fund is carrying. A book that is 130% long and 60% short has 190% gross and 70% net exposure: it holds nearly twice its capital in positions while taking market risk on 70% of it.
How does a long/short fund make money when the market falls?
Through the short leg and through selection. If the market falls 10% and the fund is 70% net long, market movement costs it roughly 7%. If its shorts fall further than its longs — say shorts down 15% against longs down 8% — the short book returns more than the long book loses on a relative basis, and the fund can finish flat or positive in a down market. That gap is the alpha the fee structure is charging for.
Where Long / Short (Equity) comes up
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