This chart shows that buying and holding stocks beats ‘sell in May and go away' and other gimmicks
The seasonal trading adage "sell in May and go away" — a staple of retail investment folklore for decades — is being put to the test by new analysis showing that buy-and-hold strategies outperform the Halloween Indicator over time. For an FX desk, this is a reminder that simplistic seasonal patterns often collapse under the weight of transactions costs and regime shifts. The story matters because it underscores a broader truth we track daily: flow-driven narratives that ignore macro fundamentals rarely survive sustained backtesting. While the headline focuses on equities, the underlying debate about seasonal positioning has a direct read-across to FX carry and risk-on/risk-off rotation patterns that we monitor closely. No currency-specific view is embedded in the piece, so our desk treats this as a thematic marker rather than a directional signal.
Where it sits in our coverage
We have no internal coverage data on the relevant currencies for this headline — no consensus target, no firm-by-firm spread. The story is equity-focused and generic, so our desk is treating it as a thematic reference point rather than a currency-specific call. We would synthesise a view from first principles if a specific G10 pair were implicated, but for now the piece sits outside our consensus framework.
How firms align
With no per-firm targets in our internal coverage related to this headline, we cannot map specific institutional views — there is no aligned or contrary firm to cite. This is not a gap in our analysis; it reflects the fact that the source material is not directed at FX markets. Our desk would only build a firm-level alignment map if the story touched a currency pair or rate differential we actively cover.
What the data shows
The article cites long-run backtesting evidence that the Halloween Indicator underperforms a simple buy-and-hold approach, which is consistent with the broader academic literature on seasonality in risk assets. For FX, the analogous seasonal patterns — such as the "January effect" in JPY or month-end rebalancing flows — tend to be weaker and less reliable than equity seasonality. We have no related Insight to cite at this time, but our desk continues to monitor whether any seasonalFX pattern gains sufficient statistical significance to warrant a tactical position.
Key takeaways
- 01Seasonal equity strategies like "sell in May" are being debunked by long-run backtesting — a cautionary note for FX traders tempted to trade calendar patterns without macro confirmation.
- 02No currency-specific signal: our desk has no consensus target or firm alignment data tied to this headline; treat it as thematic context only.
- 03Watch for any spillover into risk-on/risk-off flows — if equity seasonality narratives shift positioning, carry trades (AUD/JPY, NZD/JPY) could see second-order effects.
- 04The broader lesson: systematic patterns that ignore transaction costs and regime shifts tend to underperform, a principle that applies equally to FX seasonality plays.
Market implications
Given the absence of a specific currency pair or level, the actionable takeaway is to monitor whether equity-market seasonality discussions begin to influence broader risk sentiment — a shift that could show up in AUD/JPY and NZD/JPY carry positioning. If equity volatility rises on seasonal repositioning, expect safe-haven flows into USD and JPY, though we have no consensus target to anchor a specific level. Calendar events such as month-end rebalancing and the May Day holiday liquidity gaps are worth flagging for traders running seasonal strategies.
Risks to this view
The view would be invalidated if a specific FX seasonal pattern — such as the Halloween Indicator applied to a currency pair — suddenly shows statistically significant predictive power, which would force a reassessment of our thematic scepticism. A shift in the macro regime, such as a major central bank policy surprise, could also override any seasonal signal and render the debate moot. Without internal firm targets, we cannot quantify the risk of being misaligned with institutional consensus.
Sentiment by currency
USD~EUR~JPY~GBP~Composite USD score: +0.00
Sources & References
How we cover this story