Explain concentration without jargon
Concentration simply means one slice has become a larger part of the account than your saved target intended.
Concentration is not a warning — it is a description of how much of your account is riding on one outcome.
What concentration means in plain terms
Concentration means one holding or category is a larger share of your account than you planned. If your target for a single ETF is 25% but it has grown to 38%, that ETF is now concentrated. The math is simple. The implication is that a larger share of your portfolio movement is now driven by that one position than your original plan assumed. Whether that is a problem depends on your goals and how you feel about single-position risk.
How concentration happens without action
A portfolio can become concentrated without any buying decision. If one ETF or stock grows faster than the rest, its share of the account increases automatically. A Canadian equity position that outperformed international equity for three years will represent more of the account even if you never added a single dollar to it. This is drift-driven concentration — passive, invisible, and cumulative.
When concentration is intentional
Some investors intentionally hold a large position in a single stock or sector because of high conviction or employer stock that cannot easily be sold. Intentional concentration is not inherently wrong — but it should be reflected in the saved target, not hidden in the gap between target and current allocation. If you are comfortable holding 40% in one position, set the target to 40% and own the choice. Unexplained concentration is the kind that causes surprises.
Describing concentration without jargon
A useful plain-language description: "Right now, a larger share of this account is in X than we planned. That means X has more influence over the account's returns than we originally intended." This framing makes the conversation about the plan, not about market predictions. It avoids describing concentration as risky (a judgment) and instead describes it as a deviation from the plan (a factual observation).