Ask any experienced trader what their biggest portfolio regret is and you'll hear some version of the same story: "I thought I was diversified, then everything fell together." That's the correlation trap — and it bites hardest during exactly the moments you need protection most. Building a minimum correlation portfolio sounds like a neat academic solution, but the implementation is genuinely tricky.
The direct answer is this: a minimum correlation portfolio deliberately selects and weights assets to minimise the average pairwise correlation across the whole portfolio — not just variance like a minimum variance approach does. On the ASX, that typically pushes allocations toward combinations of miners, REITs, healthcare names, and the occasional infrastructure stock, because these sectors historically move on different drums. The goal isn't the highest return per unit of risk; it's the lowest tendency for everything to nosedive simultaneously.
The methodology starts with a rolling correlation matrix — typically 60 to 252 trading days — calculated across your eligible universe. From that matrix, you derive an average correlation score for each asset versus all others. Weights are then assigned inversely proportional to each asset's average correlation score. Assets that zig when everything else zags get the heaviest allocation. It's the portfolio equivalent of hiring the one team member who disagrees with everyone — annoying at dinner, invaluable in a crisis.
Backtested results on ASX 200 constituents generally show meaningful drawdown reduction during periods like the 2008 GFC and the 2020 COVID crash compared to equal-weight or cap-weight benchmarks. The friction, though, is real. Brokerage on frequent rebalancing, liquidity constraints in smaller ASX names, and the tax drag from constant turnover can quietly erode the theoretical edge. For further reading on the mechanics, Investopedia's correlation explainer is a solid foundation, while the academic rigour lives in modern portfolio theory on Wikipedia. The specific minimum correlation construction method is covered thoroughly under portfolio diversification theory.
Pull your current holdings, run a 120-day rolling correlation matrix in Excel or Python, and check the average correlation score of each position — you might be surprised how many "different" stocks are actually moving in lockstep.
Diversification isn't about owning more things — it's about owning things that disagree with each other.
This content is for educational purposes only and does not constitute financial product advice. Past performance is not indicative of future results. Profit Logic Ltd (ACN 688 669 936) accepts no responsibility for errors or omissions in this content or anywhere on this website. Always seek advice from a licensed financial adviser before making investment decisions.