When a winner becomes your biggest risk: concentration, explained

Short answer

Concentration risk means so much of your wealth depends on one company, sector, country or currency that a single bad event could change your plans. It usually grows quietly from success: a winning stock, a founder's shares, a property. Managing it starts with seeing your total exposure, then choosing a limit on purpose.

How concentration happens to successful people

It is rarely a decision. A stock bought early rises until it dominates the portfolio. Shares in a company you founded or joined become most of your net worth. Holdings that look different all depend on the same industry or the same currency. Success, left alone, concentrates.

The hidden kind: overlap

Two funds and three stocks can all lean on the same handful of large companies. On paper you hold many things; in practice one story drives them. Overlap is concentration you cannot see from the list of names.

Wealth your bank does not hold

Company equity, options, property and private investments often sit outside your bank's view. A portfolio that looks balanced at the bank may sit on top of a much larger single exposure elsewhere. Seeing your total wealth together is the only way to see this risk.

Questions to ask

• What share of my total wealth depends on one company, sector or currency?
• Where do my funds and stocks overlap?
• What would a sharp fall in my largest exposure do to my plan?
• Is there a limit I want to set, and how would I know the day I cross it?

Choosing a limit on purpose

Some people stay concentrated for good reasons: conviction, control, tax or timing. That can be a sound choice. The risk is not concentration itself, but concentration nobody decided. Writing a limit down, for example “never more than a fifth in one name”, turns a drift into a decision you can watch.

The risk is not concentration. It is concentration nobody decided.

Quick questions

What is concentration risk?

Having so much wealth in one company, sector, country or currency that one bad event could change your plans.

Is it always wrong to hold a concentrated position?

No. Founders and long-term holders often stay concentrated on purpose. The risk is concentration that grew without a decision or a limit.

How do I see my total concentration?

Bring together what your bank holds and what it does not, such as company shares, options and property, and look at the largest single exposures across all of it.

General information only, not personalised investment advice. Speak to your licensed adviser before acting.