Trend Following and Crisis Alpha: Revisiting the Evidence

1. The Crisis Alpha Narrative

The term "crisis alpha" was popularised by Kaminski (2011) and refers to the tendency of trend following strategies to profit during sustained market downturns. The mechanism is intuitive: if equities enter a prolonged decline, a trend follower will eventually establish short equity positions and profit from the continuation of the decline. This makes trend following a natural complement to long-only portfolios — it provides returns precisely when the portfolio most needs them.

The narrative is supported by historical evidence. The SG Trend Index returned +18.4% in 2008, when the S&P 500 fell 37%. During the COVID-19 crash of early 2020, many CTA strategies posted positive returns while equities experienced their fastest drawdown in history. These data points are widely cited in CTA marketing materials and allocator due diligence reports.

But the complete picture is more nuanced. Trend following strategies also lost money during several equity corrections, most notably the sharp V-shaped reversals that have become more common in the era of central bank intervention. The question for allocators is not whether crisis alpha exists in some historical episodes, but whether it is reliable enough to serve as a portfolio hedge.

2. Data and Methodology

We use the SG CTA Index and its sub-indices (Short-Term Traders, Diversified, and Systematic) from January 2000 to June 2023. We identify all periods where the S&P 500 experienced a peak-to-trough drawdown exceeding 10%, yielding 8 distinct episodes. For each episode, We compute the cumulative return of each CTA sub-index and classify it as "positive crisis alpha" if the CTA return exceeded the risk-free rate during the equity drawdown period.

3. Results by Crisis Type

Table 1: CTA index performance during equity drawdown episodes. Green-highlighted rows are episodes where the SG Trend Index delivered positive crisis alpha.

The pattern is clear: trend following delivers strong crisis alpha during prolonged, directional drawdowns (dot-com, GFC, 2022 rate hikes) but fails during sharp, short-lived corrections (2011, 2015, 2018 Q4, 2023). Of the 8 episodes, trend following provided positive returns in 4 — a 50% hit rate. This is better than equity buy-and-hold (0% by definition during drawdowns) but far less reliable than the marketing narrative suggests.

4. The Duration Dependence

The critical variable is drawdown duration. Trend following systems need time to identify and act on a new trend. A typical 3-month moving average crossover system requires at least 2–3 months of declining prices before establishing a meaningful short position. If the drawdown is shorter than this — as in the COVID crash (1 month peak to trough) or the 2015 China devaluation (2 months) — the system has not yet positioned for the downturn when the recovery begins.

We estimate that a minimum drawdown duration of approximately 3 months is needed for diversified trend following to reliably capture crisis alpha. For short-term trend followers (holding periods of 1–4 weeks), the minimum duration is shorter — approximately 3–4 weeks — but the magnitude of the alpha is smaller because shorter-term signals are noisier and generate more whipsaw during volatile periods.

5. The Changing Nature of Crises

There is a secular concern: post-GFC crises have been shorter and sharper than pre-GFC crises. The median drawdown duration in our sample has declined from approximately 6 months (2000–2010) to approximately 2 months (2011–2023). This is consistent with the increased role of central bank intervention, which truncates drawdowns by providing liquidity support and forward guidance.

If this trend continues, the conditions under which trend following reliably provides crisis alpha — sustained, directional drawdowns lasting 3+ months — will become less common. The 2022 rate-hiking episode was an exception: a prolonged, directional move driven by fundamental policy change that trend followers captured effectively. But it was the only such episode in the post-2010 era. The base rate for reliable crisis alpha may be lower going forward than the historical record suggests.

6. Implications for Portfolio Construction

Allocators who include CTA allocations specifically for crisis protection should temper their expectations. Trend following is not a put option — it does not provide guaranteed protection during every equity drawdown. It is better described as a conditional hedge: it works when the crisis is slow enough for the strategy to adapt, and fails when the crisis is too fast.

A more honest framing is that trend following provides diversification across time and market regimes, with crisis alpha as an occasional bonus rather than a reliable feature. The allocation should be justified by the strategy's stand-alone risk-adjusted return profile — typically a Sharpe ratio of 0.3–0.7 depending on the period — rather than by the promise of crisis protection.

For traders building their own systematic portfolios, combining trend following with other strategies that perform well in different crisis types — such as short-term mean reversion (which profits from V-shaped reversals) or long volatility (which profits from all types of stress) — provides more robust all-weather protection than relying on trend following alone.