The Case For Long-Short Equity: Four Reasons To Include The Strategy In A Portfolio

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The Case For Long-Short Equity: Four Reasons To Include The Strategy In A Portfolio by Juliana Hadas, CFA & Andrea Pompili – Neuberger Berman

The task of balancing equity risk with the goal of achieving meaningful returns is top-of-mind for many investors. The search is on for strategies that can fill this role, whether through asset allocation or choice of securities within the equity space. Into this fray appear long-short equity strategies, which allow managers to assume both long and short positions in their ideas and to vary their exposure to the equity market over market cycles. We believe that long/short strategies, with their risk-managed alpha generation potential, are worth consideration as part of an investor’s equity allocation and the overall investment mix.

In our view, there are four key reasons to consider an allocation to long-short equity strategies:

  1. Unlock different sources of alpha
  2. Reduce equity beta risk
  3. Improve return/risk profile of an equity allocation
  4. Access through new, “liquid alternative” fund structures that offer daily liquidity, lower fees and more transparency.

The universe of long/short funds can be subdivided into three main sub-strategies: long-biased (funds that hedge out some, but not all, market beta), equity market neutral (funds that hedge out all market beta and focus exclusively on alpha generation), and short-biased. The focus of this paper is long-biased long/short funds.1,2

Long-Short Equity – Reason #1: Unlock Different Sources Of Alpha

The ability to engage in short-selling increases a portfolio manager’s opportunity to generate alpha from security selection. Without an ability to short, a negative view on a security can only be expressed by not holding that security, and the magnitude of the underweight relative to the index is limited to the security’s weight in the benchmark. For many securities, this weight amounts to mere basis points. The ability to short eliminates such constraints. By hedging out some market risk (beta), shorting also enables long/short funds to take bigger positions in their higher-conviction long ideas compared to more constrained long-only strategies. Furthermore, a long/short manager can invest more than 100% of the portfolio long by using proceeds from the short sales (although not all managers use leverage in this manner, and some fund structures are subject to certain regulatory constraints regarding maximum allowable leverage, as discussed later in this paper).

In addition to shorting, long/short funds have the flexibility to deviate from an equity benchmark in terms of the portfolio’s size and style focus and composition in a way that more benchmark-centric long-only managers may not be able to do. These factors can allow long/short hedge funds to take advantage of the manager’s investment expertise in sector selection. A long/short hedge fund may perform intense sector research and form a thesis on the relative performance of an entire sector. If the fund believes that the given sector should outperform, the manager can significantly overweight the sector relative to a benchmark. Conversely, if the fund formulates a negative view on the sector, it can short the sector, using either individual stocks or a broader ETF to express the view.

Long/short hedge funds can similarly express their views on a specific geographic region. Long/short hedge funds can also use out-of-benchmark securities to attempt to generate alpha on both the long and short sides, in a way that more benchmark-centric long-only managers may not be able to do. Such securities can include stocks in different regions, or of different market capitalization or style, than those in the manager’s benchmark.

Empirical evidence suggests that security selection skill on the long side of hedge funds’ trades can add meaningfully to their performance (for further discussion, please see Appendix A). There is less data available to analyze the effect of security selection skill on the short side, but anecdotal evidence suggests that alpha generation capabilities on the short side vary substantially by manager.

Long-Short Equity – Reason #2: Reduce Equity Beta Risk

Short exposure, when used to balance long exposure, works to reduce market beta—betas on the long side and the short side will partially offset each other. In addition, long-short equity funds are able to hold cash in their portfolio, with fewer constraints than is the case for more benchmark-centric long-only managers. These two factors help reduce beta and volatility.

Often, long/short funds have a modest net long bias (around 30% – 60%); however, as Figure 1 shows, over the past 10 years it has generally varied from a low of around 20% to a high of around 75%. Historically, when equity market volatility has been high, long/short managers decreased their net exposure; when volatility has been subdued, they raised their net exposure back up (see Figure 1).

long-short equity funds’ beta to global equities is typically in line with their net exposures, and has averaged around 0.5 over the long term (see Figure 2).

Long-Short Equity

With this level of beta, long/short funds tend to underperform equity markets in strong, sustained bull markets, but are able to mitigate downside risk and outperform in market downturns. Historically, long/short hedge funds have in fact achieved attractive downside risk mitigation in down markets compared to long-only benchmarks (see Figure 3).

Long-Short Equity

Long-short equity fund beta has varied, from a low of 0.30 to a high of 0.70 over the past 20 years,3 partly based on overall equity market conditions—generally, beta has been higher in strong markets and lower in challenging markets. In this way, long/short managers can be viewed as engaging in tactical asset allocation.

Long-Short Equity – Reason #3: Improve Return/risk Profile Of An Equity Allocation

An analysis of the historical performance of the long/short hedge fund universe, as proxied by the Credit Suisse and HFR indices, shows that historically, long/short funds have achieved better risk-adjusted performance over market cycles than long-only managers and benchmarks, generating equity-like returns with about half the volatility of equity markets (see Figure 4).

Long-Short Equity

Comparing long/short funds to a universe of actively managed equity strategies presents a similar picture (see Figure 5).

Long-Short Equity

In this way, the universe of long-short equity funds has used its equity risk capital more efficiently than has the universe of long-only managers or broad equity benchmarks. Including long/short funds in a portfolio, therefore, has the potential to improve the portfolio’s overall return/risk ratio. In addition, for investors employing risk-balanced asset allocation models, such efficiency may free up a portion of the risk budget to deploy elsewhere.

Long-Short Equity – Reason #4: Access Through New, ‘liquid Alternative’ Fund Structures

Increasingly, hedge fund strategies are available in retail fund vehicles, such as U.S. registered funds (’40-Act funds) and offshore UCITS funds, providing much wider access to hedge fund strategies. In our view, the new fund structures have significant benefits in terms of liquidity, fees and regulatory oversight.

Hedge funds have generally been structured in a less liquid format than traditional asset classes, with periodic (often monthly or quarterly) redemption periods and, in many cases, limits on how quickly an investor can redeem after the initial investment (lock-up periods) and/or on how much investors can redeem at a time (gates).

Liquid alternative funds, by contrast, offer daily liquidity and NAV. This can aid investors in tactical portfolio rebalancing and help limit the portfolio’s illiquidity in a crisis event. It can also free up a portion of the investor’s illiquidity budget for other strategies that may not lend themselves to daily liquidity and that may have the potential to offer a significant illiquidity premium.

The fees charged by liquid alternatives are typically lower than fees on traditional hedge fund vehicles. Unlike traditional hedge funds, ’40-Act funds do not charge performance-based fees (although UCITS funds may charge such fees).

In addition, liquid alternative funds offer greater transparency (including positions, leverage and valuations) compared to traditional hedge fund structures, and must meet certain regulatory constraints regarding maximum allowable leverage and minimum amount of assets exhibiting daily liquidity. A majority of their holdings must be able to be liquidated in the public markets at quoted prices. They must hold collateral related to the liabilities from the use of short sales. Leverage in such structures is limited as a proportion of the gross asset value of the fund. We believe long/short strategies are particularly well-suited to meet these requirements, with the fund structure typically having limited impact on their strategy or process, given the nature of the securities in which they invest and the typical amount of leverage they employ.

Other Considerations

How Much to Allocate, and Where in the Portfolio?

Since long/short hedge funds invest in equities, and since their correlations to equity markets are around 0.9,4 investors may wish to consider long/short hedge funds as implementation vehicles for their equity exposure—in our view, an attractive complement to long-only strategies—rather than as part of an “alternatives” allocation.

The “optimal” allocation to long-short equity funds varies by investor and is largely a function of the investor’s risk appetite in equity markets. Figure 6 shows an illustrative risk/return tradeoff, with a 100% long-only portfolio, a 100% long/short portfolio, and a 50/50 portfolio of long-only and long/short. Investors can choose the point on the chart at which they are most comfortable with the overall risk level.

Investors should also consider how much tolerance for risk they may have during periods of market downturns. (Figure 3 illustrates drawdowns experienced by equity markets and long/short funds over the past 20 years.)

Importance of Manager Selection

In our view, manager skill is critical in a successful long/short investment program. Alpha can be either positive or negative, and the fewer constraints on investing, the larger is its potential magnitude (on the upside or downside). In fact, dispersion among individual manager returns is substantial in hedge funds.

As an example, Figure 7 shows the dispersion of 1-, 3-, 5-, and 10-year returns for a peer group universe of U.S. equity-focused long/short managers versus the eVestment peer group universe of U.S. equity-focused long-only managers. The variation is substantial, and meaningfully larger for the long/short peer group than is the case of long-only managers.

Long-Short Equity

Return and risk profiles also differ by funds’ gross exposure levels and shorting strategies. Holding net exposure constant, a fund with larger gross exposure is running a more active portfolio than a fund with smaller gross exposure. Therefore, the former fund would have more capacity to generate alpha (positive or negative) and can also have higher drawdowns and/or volatility. Similarly, funds that engage in fundamental shorting of individual securities have the potential for extra alpha generation (again, positive or negative) relative to funds that engage only in overall market shorting that acts solely as a beta hedge to its long positions.

Recent Performance and Outlook

The beginning of this decade was a challenging time for long/short hedge fund performance, with the overall universe having generated negative Jensen’s alpha (risk-adjusted excess returns)—see Figure 8. However, alpha has been rebounding starting with the second half of 2012—a trend we believe will continue. In our view, much of the underperformance in the earlier period and the subsequent rebound can be attributed to two major challenges experienced by the broader equity markets in this time frame.

Challenge 1: High Inter-Stock Correlations

The period between the global financial crisis of 2008 and the second half of 2012 was characterized by abnormally high correlations between stocks. Stock movements were driven more by macroeconomic developments and overall market sentiment and less by individual company fundamentals. Such an environment creates headwinds for funds that focus primarily on security selection, which is the case for most long/short hedge funds. Figure 8 shows the impact that inter-stock correlations have historically had on hedge fund alpha. It shows the rolling one-year Jensen’s alpha of the HFR Equity Hedge Index over both the Russell 3000 and the MSCI ACWI Indices and compares it to average rolling one-year stock pairwise correlations over time. (Data for the Credit Suisse Index looks quite similar.) The alpha has had an inverse relationship with the pairwise correlations, declining when correlations increased and increasing when correlations declined. As inter-stock correlations have started to trend down since mid-2012, hedge fund alpha has started trending back up.

Long-Short Equity

Challenge 2: Low Interest Rates

Higher interest rates increase a business’s cost of capital, leading to increased differentiation in the performance of companies with different capital structures. With higher rates come higher interest expenses, and a company with relatively thin operating margins and too much leverage may find its debt burdens providing significant headwinds in such an environment. On the other hand, a company with less debt and higher operating margins will likely fare better in such an environment. Historically, there has been a positive correlation between intermediate-term interest rates (a key component of corporate capital costs) and the amount of valuation dispersion (based on companies’ price-to-earnings multiples) in the market.5 There has also been a positive correlation between valuation dispersion in the market and hedge fund Jensen’s alpha (see Figure 9).

Long-Short Equity

Once interest rates begin to rise and approach historical norms, we believe that valuation dispersion should also increase, leading to an environment in which fundamental stock pickers with more effective security selection can be better rewarded.

Another challenge of near-zero interest rates has been their impact on the short rebate, the interest a fund receives on cash proceeds from its short sales, less the various transaction costs and borrowing fees associated with the mechanics of shorting. Typically these proceeds are held in an interest-bearing money market account. In the current environment of near-zero interest rates, the short rebate does not amount to much (and may in fact be negative, as transaction costs may outweigh the interest), but in a more normalized (e.g., pre-crisis) interest rate environment, the short rebate has added as much as 150 – 200 basis points of performance for managers with substantial short exposure.6


Long-short equity can play an important role in a portfolio’s equity allocation, with the potential to reduce equity risk, improve one’s overall risk-return profile, and unlock additional sources of alpha compared to more benchmark-centric long-only equity strategies. Historically, long-short equity funds have achieved equity-like returns with less volatility than equity markets via, in our view, a combination of security selection (as evidenced by their 13F filings) and asset allocation skill (varying their net exposure and beta based on various market regimes). Because long/short hedge funds invest in equities, we believe that they may be considered as implementation vehicles within the investor’s equity exposure, rather than as part of an “alternatives” allocation. With the growth of the liquid alternatives space, investors have more flexibility than ever in choosing implementation options that better fit their needs.

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