Step 10
Level: beginner
Concentration risk appears when one position, industry, macro factor or thesis has too much influence on portfolio results. If only looking at each individual position, investors easily ignore the aggregate risk of the entire asset.
Concentration can be intentional if the investor has a clear edge, but there must be a limit to the weight and risk scenario. Check concentration by holding, industry, country, currency, interest rate factor, liquidity and personal income source. A good portfolio needs to both serve its goals and withstand fluctuations and changes in investors' lives.
When there are clear rules on weight, review, rebalancing and stress testing, investors are less likely to have to make decisions in a state of panic or excitement.
Concentration risk appears when one position, industry, macro factor or thesis has too much influence on portfolio results.
Managing a portfolio is different from choosing a good investment idea. A good asset can become risky if the weight is too large, the time horizon is unsuitable or the correlation with the rest of the portfolio is too high. Therefore, the focus of Step 10 is on how to run the portfolio according to the chosen goal.
Concentration can be intentional if the investor has a clear edge, but there must be a limit to the weight and risk scenario. Check concentration by holding, industry, country, currency, interest rate factor, liquidity and personal income source.
Portfolios should be evaluated in three layers. The first layer is the goal: what the portfolio is meant to serve and for how long. The second layer is structural: asset weights, correlation, liquidity and concentration risk. The third layer is operational: when to review, when to rebalance, when to reduce risk, and when to do nothing.
Set a weight limit before the position increases rapidly, because after large gains, emotions often make you relax your discipline.
Portfolio rules need to be measurable. For example: maximum weight of a position, minimum cash weight, rebalancing threshold, drawdown level to review or stress test schedule. If the rule is just a general intention, it is often broken when the market is volatile.
Looking only at the weight of each holding ignores the fact that many different holdings have the same source of risk.
Mistakes often do not come from a single position, but from many small deviations that accumulate: excessive weight, shared-source risk, failure to rebalance, lack of cash or emotional behavior. Good portfolio management is about detecting these deviations before they become major losses.
Risk due to the portfolio depending too much on one asset or one source of risk.
The maximum amount allowed to be allocated to a position, sector or risk group.
How to look across each asset to see what risk a portfolio is truly exposed to.
Portfolios can serve long-term growth, capital preservation, income generation, medium-term goals or a combination of goals.
Portfolio risk can come from asset class, industry, individual positions, liquidity, leverage, correlation or investor behavior.
The portfolio needs rules on weight, rebalancing, review, stress testing, cash and action triggers.
Application in portfolio management
A person who works in the real estate industry, owns a home with debt and holds many real estate stocks is focusing on the same credit cycle.
Actual risks
Looking only at the weight of each holding ignores the fact that many different holdings have the same source of risk. When this happens repeatedly, the portfolio can deviate from its original goals, with the investor only realizing after the damage has been done.
Returns alone do not show what risk the portfolio is taking on. Monitor weight, drawdown, liquidity and target deviation.
If investors do not know when to review or rebalance, they can easily delay until emotions take over.
Looking only at the weight of each holding ignores the fact that many different holdings have the same source of risk. Safety depends on the source of risk and concentration, not just the number of assets.
Exercise 1 - reflection
What issues does your current portfolio exhibit regarding concentration risk & weight control? Describe with data if possible.
Exercise 2 - case_study
A person who works in the real estate industry, owns a home with debt and holds many real estate stocks is focusing on the same credit cycle. Identify portfolio risks, signals that need to be reviewed and define the appropriate action.
Exercise 3 - action_plan
Create five portfolio operating rules that you will use over the next 12 months.