Long/Short Equity

A long/short book separates two decisions that a traditional long-only portfolio bundles together: which securities to own and how much market exposure to carry. Longs are funded partly with equity capital and partly with borrowed money; shorts are established by borrowing shares from a prime broker, selling them, and posting the proceeds as collateral. Because the short proceeds finance additional long positions, gross exposure routinely exceeds capital, so leverage is intrinsic to the structure rather than optional.

Exposure is described with two figures. Gross exposure sums the absolute value of longs and shorts relative to capital and captures how much security-specific risk the manager has taken on. Net exposure subtracts shorts from longs and captures directional sensitivity. A book with 120 percent long and 40 percent short runs 160 percent gross and 80 percent net: heavily leveraged in stock selection terms, yet still meaningfully exposed to a broad equity decline.

Long/short equity is the largest single category within the hedge fund universe by asset count, and it spans a wide range of risk profiles. Fundamental generalists build concentrated books around company research; sector specialists in technology, healthcare or financials exploit the dispersion within an industry; quantitative managers hold hundreds of small positions ranked by factor signals. Related variants sit along the same continuum: equity market neutral targets near-zero net exposure and relies almost entirely on relative pricing, while dedicated short bias runs persistently negative net exposure.

The same logic appears in regulated products. A 130/30 mandate is a long-only benchmark-relative fund permitted to short 30 percent of assets and reinvest the proceeds, producing 160 percent gross and 100 percent net exposure. Liquid alternative mutual funds and UCITS vehicles offer diluted versions with tighter leverage and shorting constraints.

Realised return has three broad components: the market return captured by net exposure, the spread earned between long and short selections, and the interest earned on cash and short-sale collateral, net of stock borrow fees and financing costs. When dispersion across stocks is high, the security-selection component dominates; in highly correlated, momentum-driven markets, dispersion collapses and even skilled managers struggle to distinguish themselves from beta.

The short leg introduces asymmetries a candidate must be able to articulate. Losses on a short are theoretically unbounded, positions grow as they move against the manager, hard-to-borrow names carry punitive fees, and lenders can recall shares at inconvenient moments. Crowded shorts are vulnerable to squeezes, and forced deleveraging by one fund can propagate losses to others holding the same book, a correlation that only appears under stress.

Expect to be asked to compute gross and net exposure from stated position sizes, and to infer approximate portfolio beta by weighting the beta of long holdings against that of shorts. Also expect to place long/short equity correctly among hedge fund categories, distinguishing it from equity market neutral, dedicated short bias, and merger arbitrage on the basis of net exposure and return source.

Qualitative judgement matters equally. You should be able to explain why a net-long fund's drawdown pattern resembles a dampened version of the equity market, why leverage magnifies both selection skill and error, and how return-based measures such as Sharpe ratio can flatter strategies with illiquid holdings or infrequent marks. Finally, recognise that performance fees on gross returns reward exposure-taking as readily as genuine selection skill, which is why exposure decomposition precedes any manager assessment.