How to know if your portfolio is too concentrated
Investors often ask this in plain language after a run-up in one stock or a portfolio full of “diversified” ETFs that all lean on the same names. This page gives a practical sequence you can follow and links to deeper tools.
Short answer: Your portfolio is likely too concentrated if (1) one position is a large share of total value, (2) your largest sector dominates the mix, or (3) several funds overlap so your true single-stock exposure is much higher than fund names suggest. Combine all accounts you care about—not just one brokerage view.
1. Start with weights, not trade count
Counting 20 positions means little if five of them are 70% of the portfolio. Compute each line item as a percentage of total portfolio value across taxable, retirement, and other accounts you treat as one plan.
2. Check top 1, top 3, and top 5
Sum the largest holdings. Compare your numbers to reference bands such as those on Portfolio concentration benchmarks (2026)—use them as guardrails, not a verdict on your personal situation.
3. Look through ETFs and funds
Two or three broad index ETFs can still concentrate you in the same dozen stocks. Use ETF overlap and the concentration risk guide to see hidden duplication.
4. Add employer stock and “theme” risk
RSUs, ESPP, and large bets on one sector (for example mega-cap tech) often fail plain “diversification” checks even when the brokerage dashboard looks balanced. Treat those as part of one consolidated picture.
Next steps (tools)
Guardfolio provides educational and analytical tools only. This is not individualized investment, tax, or legal advice.