Long/Short Investing Explained

Long/short investing combines long positions in expected outperformers with short positions in expected underperformers. The strategy aims to generate returns from both rising and falling stocks, theoretically producing returns less dependent on overall market direction than pure long-only investing. It's the foundational strategy of most hedge funds and one of the most challenging investment approaches to execute successfully.

What it measures

Long/short investing involves multiple structural decisions:

Net exposure: The difference between long and short positions:

• Long bias: More longs than shorts. Net positive market exposure.
• Market neutral: Approximately equal longs and shorts. Net zero market exposure.
• Short bias: More shorts than longs. Net negative market exposure.

• Conservative: 100% gross (50% long + 50% short = no leverage).
• Moderate: 130/30 (130% long + 30% short = 100% net long with leverage).
• Aggressive: 200%+ gross often using significant leverage.

Equity long/short: The classic structure. Long positions in expected winners, short positions in expected losers.

130/30: 130% long and 30% short. Maintains market exposure while adding short alpha potential. Less risky than fully market neutral.

Market neutral: Beta-adjusted equal long and short positions. Returns come purely from relative selection.

Short-only: Pure short bias. Profits from declining stocks. Has been a difficult strategy in long-running bull markets.

Sector/factor neutral: Long high-quality stocks, short low-quality stocks within sectors. Or long value, short growth. Or long momentum winners, short momentum losers.

How to use it in practice

Long/short rests on the premise that talented stock selectors can identify both stocks that will outperform and stocks that will underperform. The strategy compounds two sources of alpha: long alpha from outperforming buys and short alpha from underperforming shorts.

The math is appealing in theory. If a manager can identify 60% winners and 40% losers in long picks (20% better than chance), the same skill on shorts adds another 20% edge. Combined, the manager has approximately 40% advantage over chance.

The reality has been more difficult:

Beta exposure matters: True market neutral is rare. Most "market neutral" funds end up with some net exposure that drives returns more than alpha selection.

Short alpha is harder than long alpha: Markets generally rise. Short positions face this structural headwind. Timing matters more than for long positions.

Borrowing costs: Short positions require borrowing shares, which costs fees. Hard-to-borrow stocks (often the most overvalued) cost more.

Short squeezes: Crowded shorts can experience devastating squeezes. The 2021 GameStop ($GME) episode showed how rapidly short positions can accumulate losses.

Behavioral pressure: Short positions feel different psychologically. Losses are unlimited; gains are capped at 100%. This asymmetry creates behavioral pressure to cover at wrong times.

The hedge fund industry has had mixed long/short results:

The 1990s and early 2000s saw spectacular long/short returns as the dot-com cycle created opportunities on both sides. Many famous hedge funds built reputations during this period.

The 2009-2021 era was difficult for long/short managers. The relentless bull market made shorts costly. The QE environment compressed dispersion. Many long/short funds underperformed simple S&P 500 buy-and-hold by significant margins.

The 2022-2024 environment has been more favorable for long/short. Higher rates, increased dispersion, and the bear/bull oscillation have created more opportunities on both sides.

The challenges for retail long/short implementation:

Margin account requirements: Short selling requires margin accounts with associated complexity and risk.

Borrowing fees: Short positions accrue daily borrowing costs that erode returns.

Dividend obligations: Short sellers owe dividends on borrowed shares to lenders.

Margin calls: Sharp adverse moves can trigger margin calls forcing liquidation at worst times.

Tax inefficiency: Short positions are typically short-term gains, taxed at higher rates than long-term capital gains.

Complexity: Tracking long and short positions, managing risk, and rebalancing creates complexity that exceeds most retail investor capacity.

For most retail investors, long/short investing is implemented through:

Long/short mutual funds and ETFs: Funds like $HDGE provide professional long/short management. However, fees are typically high and returns have often disappointed versus simple long-only strategies.

Inverse ETFs: $SH (short S&P 500), $PSQ (short Nasdaq 100) provide tactical short exposure without direct shorting complexity. Useful for short-term hedging but problematic as long-term holdings due to compounding decay.

Options: Put options provide downside exposure with defined risk. More complex than direct short positions but with limited downside.

Pair trades: The simpler subset of long/short focused on specific relative bets rather than broad portfolio construction.

The advantages of long/short:

Absolute return potential: Theoretically can generate positive returns in any market environment.

Lower volatility: Hedged positions reduce overall portfolio volatility.

Diversification benefit: Returns less correlated with broad market when properly executed.

Alpha potential: Combines long and short alpha for higher information ratio.

The challenges:

Difficult to execute: Most long/short funds underperform simple benchmarks over time.

High costs: Borrowing fees, transaction costs, and management fees erode returns.

Behavioral demands: Requires holding losing positions on both sides through volatility.

Skill requirements: Genuinely identifying both undervalued and overvalued stocks consistently is rare.

Common mistakes

Treating long/short as insurance. It's an active strategy, not insurance. Long/short funds can lose money in down markets if positioning is wrong.

Overestimating short selection skill. Most investors are better at identifying winners than losers. Short alpha is typically more elusive than long alpha.

Ignoring borrowing costs. Short positions accumulate fees daily. Hard-to-borrow stocks may cost 5-50%+ annually to maintain shorts.

Using leveraged inverse ETFs as long-term holdings. Leveraged and inverse products bleed value over time due to volatility decay. They're tactical instruments, not buy-and-hold.

ACCE perspective

Long/short investing isn't directly in our scoring system because our framework focuses on long-only stock and index selection for retail investors. We provide tools for identifying both quality opportunities (long candidates) and weaker businesses (avoid candidates), but don't construct short positions.

For most retail investors, long/short complexity exceeds practical benefit. The combination of borrowing costs, margin requirements, tax inefficiency, and behavioral challenges makes the strategy difficult to execute successfully. Long-only implementations focused on quality and discipline often produce better outcomes than attempts to add short alpha.