Alternative Risk Premia: Systematic Factor Harvesting Beyond Equity Beta

Alternative risk premia (ARP) represent one of the more intellectually sophisticated concepts in contemporary portfolio construction. The idea is that financial markets reward investors for bearing specific, identifiable risks beyond the familiar equity market risk premium — and that these additional premia can be harvested systematically, cost-effectively, and in a way that genuinely diversifies a traditional equity-and-bond portfolio. Execution, however, has proven considerably more difficult than the theory suggests, and investors considering ARP allocations need to understand both the promise and the disappointments of recent years.

What Are Risk Premia?

A risk premium is the additional return that investors require for bearing a specific risk beyond the risk-free rate. The best-known risk premium is the equity risk premium: equity investors accept greater short-term volatility in exchange for expected higher long-run returns than government bonds. This premium has been well documented across markets and time periods.

Academic finance has identified numerous additional risk premia beyond equity beta — sources of expected return associated with bearing specific risks or exploiting persistent market inefficiencies:

Value: Cheap securities (measured by book-to-market, price-to-earnings, or similar metrics) outperform expensive securities over long periods. The risk rationale is that cheap companies tend to be in economic distress — investors require a premium to hold them.

Momentum: Securities that have performed well recently tend to continue outperforming in the near term; poor performers continue underperforming. The behavioural explanation involves investor anchoring, herding, and slow information diffusion.

Carry: Instruments offering high yield tend to outperform low-yield alternatives, where the yield reflects expected risk. Classic carry is found in FX (high-yield currencies vs low-yield currencies), but carry premia exist in bonds, equities, and commodities.

Quality: Companies with strong profitability, stable earnings, and conservative balance sheets tend to outperform companies with poor fundamentals on a risk-adjusted basis over time.

Low volatility: Counterintuitively, lower-risk stocks tend to outperform higher-risk stocks on a risk-adjusted basis — an anomaly that has been attributed to leverage constraints and investor preference for lottery-like high-volatility stocks.

Size: Smaller companies have historically outperformed larger companies over long periods, though this premium has been questioned in recent data.

Alternative Risk Premia vs Factor ETFs

Both ARP funds and factor ETFs seek to harvest these premia, but there are important structural differences:

Factor ETFs (such as iShares MSCI World Value ETF or Xtrackers MSCI World Momentum) provide long-only exposure to a single factor within a single asset class (typically equities). They are simple to access, highly liquid, and cost around 0.1–0.3% per annum. The trade-off is that they remain heavily correlated with the equity market — a value ETF still falls significantly in an equity bear market.

ARP funds attempt something more ambitious: they implement factors simultaneously across multiple asset classes (equities, bonds, FX, commodities) using long-short positions. By going long cheap assets and short expensive ones within each asset class, ARP strategies aim to isolate the pure factor premium while hedging out overall market direction. The result — in theory — is a return stream that is uncorrelated with equity and bond markets.

The long-short construction is both the source of ARP's theoretical diversification benefit and the source of its operational complexity and fee drag. Shorting requires stock borrowing (and associated costs), daily margin management, and sophisticated infrastructure. These costs, combined with manager fees, are why ARP funds charge 0.5–1% per annum (or higher with performance fees) rather than the 0.1–0.3% of simple factor ETFs.

The Factor Zoo Problem

A serious caveat to ARP investing is what academics have called the "factor zoo": as of 2023, over 300 distinct factors had been published in peer-reviewed academic journals, each purporting to predict security returns. Many of these factors are spurious — they reflect data mining rather than genuine economic premia.

Research by Hou, Xue, and Zhang, among others, found that the majority of published anomalies failed to replicate out-of-sample when more rigorous statistical tests were applied. The factors most likely to represent genuine premia are those with:

• Long-documented academic history (predating their discovery becoming widely known).
• Economic rationale (a plausible risk or behavioural explanation).
• Persistence across multiple countries and asset classes.
• Positive performance net of transaction costs.

Value, momentum, carry, and quality broadly meet these criteria. Many of the more esoteric published factors do not.

ARP Performance: 2018–2022 Underperformance and Recovery

ARP strategies attracted substantial institutional investment in 2015–2017, with many large pension funds, sovereign wealth funds, and endowments allocating meaningfully to ARP funds as an alternative to hedge fund fees with more transparent factor exposure.

The performance that followed was deeply disappointing:

• 2018: A broad ARP drawdown as value strategies (long cheap, short expensive) suffered from growth's continued outperformance and momentum reversals in Q4.
• 2020: Covid-driven market dislocation caused correlated drawdowns across many ARP strategies simultaneously — in particular, momentum suffered a severe reversal as the market bounced sharply from March lows.
• 2021–2022: Value strategies began to recover as rate expectations shifted; carry strategies benefited from rising yield differentials.

By 2023–2025, some of the best-known ARP funds had partially recovered from the deep drawdowns of 2018–2020. However, many institutional allocators reduced or exited ARP programmes during this period of underperformance, crystallising losses and missing the subsequent recovery — a classic pattern of buying high and selling low in response to multi-year trailing returns.

The lesson for investors is that ARP strategies — like all systematic factor strategies — experience extended drawdown periods (3–5 years) that require patience and conviction to endure. Investors who cannot tolerate prolonged underperformance relative to simpler alternatives are not well suited to ARP.

Capacity Constraints

ARP and factor strategies face capacity limitations. The more capital that is allocated to a specific factor strategy, the more the prices of the target securities are bid up (in the case of long positions) or shorted down, reducing the future premium. Academic factors identified when capital flows into them are, in the extreme, arbitraged away.

In practice, the most liquid and well-documented factors (value, momentum, quality in large-cap equities) have substantial capacity — hundreds of billions in aggregate. More esoteric factors or those in less liquid markets have tighter capacity constraints. As ARP grew in institutional adoption through 2013–2018, there was genuine concern that crowded factor positioning was reducing premia. The 2018–2020 period of underperformance was partly attributed to this crowding and the subsequent liquidation of leveraged factor positions.

Fund Structures and Providers

Institutional ARP funds: Goldman Sachs Alternative Access (GSAA), JPMorgan Alternative Risk Premia, and similar offerings from major investment banks provide direct ARP exposure through UCITS or offshore fund structures. Minimum investments are typically £500,000–£5m. These are intended for institutional investors and sophisticated HNW allocators.

Systematic hedge funds: Man Group's AHL, Winton, and similar CTA/systematic managers offer products that blend trend-following with ARP-type factor strategies. These are accessible via offshore funds (for qualifying investors) or UCITS equivalents.

UCITS ARP funds: A growing number of UCITS-compliant ARP funds provide daily-liquidity access for European investors, with minimum investments from £25,000 in some cases. Examples include Amundi and BNP Paribas systematic strategies. Total expense ratios are typically 0.5–1.5% per annum.

Fee Comparison

Vehicle	Typical Fee
Single-factor ETF (value, momentum)	0.15–0.35% per annum
Multi-factor ETF (long-only)	0.2–0.4% per annum
UCITS ARP fund (long-short)	0.5–1.5% per annum
Offshore ARP fund	1–1.5% + 10–20% performance fee

The fee differential between long-only factor ETFs and long-short ARP funds is substantial. Whether the diversification benefit of the long-short construction justifies the fee differential is a question that reasonable investors answer differently.

ARP strategies involve complex risks including leverage, short selling, and the risk of prolonged underperformance. Factor premia are not guaranteed and can disappear or reverse. This guide is for informational purposes only and does not constitute financial advice. Past performance is not a reliable guide to future results. Seek qualified professional advice before investing in ARP strategies.

How Global Investments Can Help

Global Investments advises sophisticated investors on incorporating alternative risk premia within a diversified portfolio construction framework. We can help evaluate whether a specific ARP allocation improves your portfolio's expected risk-adjusted return, identify appropriate fund vehicles given your investor status and domicile, and conduct due diligence on specific managers' factor construction, leverage usage, and historical drawdown experience. Contact our investment team to discuss whether ARP is appropriate for your portfolio.