Academy glossary: portfolio and risk terms explained

A handful of terms come up in almost every conversation about building or tracking a portfolio. This page defines them plainly, with sources, so you can look one up in under a minute and move on. Each entry stands on its own and links to a longer guide where one exists.

What is a portfolio?

A portfolio is the complete set of financial assets an individual or institution holds and manages as a single unit, rather than as separate, unrelated positions. The U.S. Securities and Exchange Commission's investor education glossary defines it as the combined holdings of stock, bond, commodity, real estate and other investments by an individual or institutional investor. That combination is what matters: a portfolio is not one stock or one fund, it is everything an investor owns, viewed together.

In practice, a portfolio can include public equities, bonds, cash and cash equivalents, mutual funds or ETFs, real estate, and alternative assets such as commodities or private holdings. What ties them together is that they are managed toward a shared objective, whether that is long-term growth, income, capital preservation, or a mix of the three, and within a shared risk tolerance and time horizon. Two investors can hold the same ten stocks and still have different portfolios if the weighting, cash allocation, or goals behind those holdings differ.

Outside of finance, "portfolio" also describes a collection of creative work, a set of products a company sells, or a group of projects a manager oversees. The finance meaning is a specific case of a broader idea: a bounded collection of things assessed and managed together rather than one at a time. On WM Platform, the term always refers to the investment sense above. Building one is covered step by step in how to build an investment portfolio, and the broader discipline of managing one, including diversification and rebalancing, sits under the portfolio management pillar guide.

See these numbers on your own portfolio. Definitions only go so far. The next two entries, risk-adjusted return and the Sharpe ratio, are two of the core metrics the Portfolio Calculator computes automatically once you enter your holdings. Create a free account to run your own portfolio through it and see where it stands.

What is risk-adjusted return?

Risk-adjusted return measures how much return an investment produced relative to the amount of risk taken to produce it, rather than looking at return in isolation. Two portfolios can post the same 10% annual return, but if one got there with far larger swings in value, it took on more risk per unit of return. Risk-adjusted return puts both figures side by side so returns become comparable across investments with different risk profiles.

The Sharpe ratio, defined below, is the most widely used risk-adjusted return measure, but others exist too, including the Sortino ratio and Treynor ratio, each weighting risk slightly differently. For a fuller treatment of how risk fits into portfolio construction, see portfolio risk management. The Portfolio Calculator surfaces risk-adjusted return alongside volatility and lowest-return figures for any portfolio you build in it.

What is a benchmark index?

A benchmark index is a market index used as a fixed reference point to judge how well a portfolio, fund, or strategy performed over a given period. It is chosen to represent the market or segment an investment is meant to compete in, so the comparison is fair: a US large-cap equity fund is typically benchmarked against the S&P 500, not against a bond index or an emerging-markets index.

Benchmarks matter because a positive return on its own says little; a portfolio up 6% in a year when its benchmark was up 12% underperformed, even though its return was positive. Comparing an index like the S&P 500 against another, such as the Nasdaq, is covered in S&P 500 vs. Nasdaq, and side-by-side comparisons of any two tickers or indices can be run directly in Compare.

Total return vs. price return: what's the difference?

Price return measures only the change in an asset's or index's market price over a period. Total return measures the change in price plus any income received along the way, such as dividends or interest, typically assumed to be reinvested. The two will differ whenever an asset makes cash distributions, which is why they can tell noticeably different stories over long periods.

For example, as an illustration only: if an index moves from 100 to 105 over a year, its price return is 5%. If it also distributed dividends equal to 2% of its value over that year, its total return is closer to 7%. For dividend-paying stocks and equity indices held over many years, that gap compounds and can become large, which is why performance figures should always specify which one they mean. It also affects how a strategy should be compared to a peer, a topic covered in passive vs. active management.

What is the Sharpe ratio?

The Sharpe ratio, developed by economist William F. Sharpe, measures the excess return an investment generates per unit of risk taken, where risk is defined as the standard deviation of returns. The formula is the portfolio's return minus the risk-free rate, divided by the standard deviation of the portfolio's returns.

A higher Sharpe ratio means more return was earned for each unit of volatility endured; a negative Sharpe ratio means the investment underperformed the risk-free rate over the period measured. As an illustrative example only: a portfolio returning 8% with a 3% risk-free rate and a 10% standard deviation has a Sharpe ratio of (8 minus 3) divided by 10, which equals 0.5.

The Sharpe ratio is one of the figures the Portfolio Calculator calculates automatically from real historical data once you build a portfolio in it, alongside volatility and lowest-return (drawdown).

Ready to see these metrics on your own numbers? Create a free WM Platform account to run the Portfolio Calculator and get a monthly email with your portfolio's return, volatility, and risk-adjusted performance. Paid plans and their limits are listed on Pricing.