Systematic Trading and Portfolio Diversification Around Brexit Risk

Summary

The author considers whether a systematic futures portfolio should be manually repositioned ahead of the Brexit vote. The stated approach is to follow the strategy’s rules rather than introduce a discretionary directional bet, especially for a close, binary political outcome that cannot be tested through the historical backtest. The post emphasizes that a global, diversified portfolio may have limited direct exposure to a single event.

It reviews example positions across currencies, European equities, volatility, government bonds, and other futures, and judges most exposure to be indirect or small. It reports overall portfolio risk below its long-run average because the strategy’s signals were relatively weak, while noting that slow trading made a major pre-vote shift unlikely. This is a snapshot of one portfolio and the author’s assessment, not a general event study or quantified sensitivity analysis. Its broader lesson is to preserve systematic discipline and use diversification to reduce instrument-specific risk.

Key ideas

• The author argues against discretionary changes that conflict with a systematic strategy’s rules.
• A close political vote is difficult to model or backtest as a one-off intervention.
• Global diversification can limit direct exposure to a single event, though indirect effects remain possible.
• The portfolio snapshot reports below-average risk associated with relatively weak signals.
• The discussion is a qualitative account of one portfolio rather than quantified evidence of Brexit sensitivity.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.