What is Efficient Frontier?
The set of portfolios that offer the highest expected return for each level of risk — the best risk/return trade-offs available from a group of assets.
Educational — not investment advice
Plot every possible mix of your assets by risk and expected return and you get a cloud of points. The upper-left edge of that cloud is the efficient frontier: for any risk level, the portfolio on the frontier gives the most return, and any portfolio below it is leaving return on the table.
Two points get names — the minimum-variance portfolio (the smoothest ride) and the maximum-Sharpe portfolio (the best return per unit of risk).
The trap most people miss
The frontier is only as good as its inputs, and it is savagely sensitive to them. Tiny changes in assumed returns can swing the "optimal" portfolio wildly, and it happily over-concentrates. Treat it as a map, not a destination.
Frequently asked about Efficient Frontier
What does the efficient frontier show?
The best achievable expected return at each level of risk from a given set of assets. Portfolios below it are inefficient; nothing sits above it.
Should I hold the "optimal" portfolio it suggests?
Cautiously. Optimizers over-trust their inputs and over-concentrate. Use the frontier to understand the trade-off, not as a literal instruction.
Related terms
Guides that use Efficient Frontier
In Tradune: plot the efficient frontier for your holdings.
Track what you actually own
Tradune puts every holding in one place — no brokerage login — and measures your return against a buy-and-hold SPY twin funded on your own dates.
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This definition is for educational purposes only and is not investment, tax, or financial advice. Concepts are explained in general terms; how they apply to your situation can differ. Always do your own research.