Financial Metrics — ISS & STOXX Glossary

About This Section

This glossary covers return calculations, volatility measures, risk-adjusted performance metrics, and factor exposures used in index analytics. Terms are sourced from STOXX and ISS Governance official documentation.

~59 terms across multiple sources.


A

Active Return

▰▰▰▰ 51

Quote

“After costs, the return on the average actively managed dollar will be less than the return on the average passively managed dollar.”

William F. Sharpe, The Arithmetic of Active Management (1991)

The difference between a portfolio’s return and its benchmark return over a given period, representing the value added (or lost) by active management decisions.

Note

active return tells you how much better or worse a fund did compared to the index it tracks. If a portfolio gained 12% and the benchmark gained 10%, the active return is +2%.

Related terms


Alpha

▰▰▰▰ 189

Quote

“The evaluation of portfolio performance requires a measure of the excess return earned beyond that expected given the level of risk.”

Michael C. Jensen, The Performance of Mutual Funds in the Period 1945-1964 (1968)

The excess return of a portfolio relative to the return predicted by the Capital Asset Pricing Model (CAPM), given the portfolio’s systematic risk exposure (beta). Alpha isolates manager skill from market movement.

Note

Alpha is the portion of a portfolio’s return that cannot be explained by broad market moves. Positive alpha means the manager outperformed what the market risk alone would have predicted.

Where is the risk-free rate and is the market return.

Related terms


Annualized Return

▰▰ 16

Quote

“Compound interest is the eighth wonder of the world.”

Albert Einstein (attributed)

The geometric average amount of money earned by an investment each year over a specified time period, compounding gains and losses into a single annual rate.

Note

Annualized return converts a total multi-period return into a yearly figure so you can compare investments held over different time spans on equal footing.

Where is the number of years in the holding period.

Related terms


B

Basis Point

▰▰▰▰▰ 456

One hundredth of one percentage point (0.01%), used to express small changes in interest rates, yields, spreads, and fund fees. 100 basis points equal 1 percentage point.

Note

Basis points remove ambiguity when discussing rate changes. Saying “rates rose 50 basis points” is unambiguous, whereas “rates rose half a percent” could be confused with a relative change. Nearly every STOXX and ISS yield, spread, and fee figure is quoted in basis points.

So a move from 2.50% to 3.00% is a change of 50 bp.

Related terms


Beta

▰▰▰▰ 194

Quote

“Beta measures the sensitivity of a stock’s return to the return on the market portfolio.”

William F. Sharpe, Capital Asset Prices (1964)

A measure of a security’s or portfolio’s systematic risk relative to the overall market. A beta of 1.0 indicates the asset moves in lockstep with the market; values above or below 1.0 indicate amplified or dampened sensitivity.

Note

Beta tells you how much a stock tends to move when the market moves. A stock with a beta of 1.5 historically rises or falls 50% more than the market in either direction.

Related terms


Book-to-Price Ratio

▰ 1

Quote

“Price is what you pay. Value is what you get.”

Warren Buffett

The ratio of a company’s book value of equity to its market capitalisation. It is the inverse of the more commonly cited price-to-book ratio and is widely used as a value factor in index construction.

Note

Book-to-price tells you how much of a company’s accounting net worth you get for each dollar of market price. Higher values suggest the stock may be undervalued relative to its assets.

Related terms


C

Cash Flow Yield

▰▰▰ 26

Quote

“Revenue is vanity, profit is sanity, but cash is king.”

Anonymous

The ratio of operating cash flow per share to the current share price. It measures how much cash a business generates relative to its market valuation and is used as a value factor in index screening.

Note

Cash flow yield is like dividend yield’s more comprehensive cousin: it looks at all the cash the business produces, not just what it pays out. Higher values can signal undervaluation.

Related terms


Compound Annual Growth Rate (CAGR)

▰▰ 6

Quote

“Compound interest is the eighth wonder of the world.”

Albert Einstein

The constant annual rate of return that would take an investment from its beginning value to its ending value over a specified period, assuming profits are reinvested. It smooths out year-to-year volatility into a single annualized figure.

Note

CAGR is the go-to metric for comparing growth rates across different time horizons. Unlike simple average returns, it accounts for compounding and gives the true geometric growth rate.

Where and are the starting and ending values, and is the number of years.

Related terms


Correlation

▰▰▰▰▰ 305

Quote

“Diversification is protection against ignorance.”

Warren Buffett

A statistical measure that quantifies the strength and direction of the linear relationship between two variables’ returns, ranging from -1 (perfect negative) to +1 (perfect positive). A value of 0 indicates no linear relationship.

Note

Correlation tells you whether two assets tend to move together, apart, or independently. It is a cornerstone of portfolio construction: combining assets with low or negative correlation reduces overall portfolio risk.

Related terms


Covariance

▰▰▰▰ 58

Quote

“The portfolio problem is to find the combination of securities that gives the investor the return he wants with the least variance.”

Harry Markowitz, Portfolio Selection (1952)

A measure of the joint variability of two random variables. In finance, it quantifies how the returns of two assets move together. Positive covariance means they tend to move in the same direction; negative means opposite directions.

Note

Covariance is the raw building block behind both correlation and beta. While its absolute magnitude is hard to interpret (it depends on the scale of returns), it feeds directly into portfolio variance calculations and the Capital Asset Pricing Model.

Related terms


Current Ratio

▰ 2

The ratio of a company’s current assets to its current liabilities, measuring its ability to pay short-term obligations due within one year. It is a fundamental liquidity metric used in credit screening and quality factor construction.

Note

The current ratio answers: “Can this company cover its near-term bills with the assets it could readily convert to cash?” A ratio above 1.0 means current assets exceed current liabilities; below 1.0 signals potential liquidity stress.

Related terms


D

Debt-to-Equity Ratio

▰▰▰▰ 87

Quote

“The one thing I can tell you is that the secret to investing is that there is no secret — except managing debt and costs.”

Benjamin Graham, The Intelligent Investor (1949)

The ratio of a company’s total debt to its total shareholders’ equity. It measures financial leverage, indicating how much of the company’s capital structure is financed by creditors versus owners.

Note

Debt-to-equity is one of the most watched leverage gauges. A high ratio means the company relies heavily on borrowed money, which amplifies both gains and losses. STOXX and ISS use it in quality screening and ESG risk assessment.

Related terms


Dividend Yield

▰▰▰▰▰ 755

Quote

“Do you know the only thing that gives me pleasure? It’s to see my dividends coming in.”

John D. Rockefeller

The annual dividends paid per share divided by the share price, expressed as a percentage. In index methodology, it typically refers to the indicated (forward-looking) annual dividend.

Note

Dividend yield shows the percentage income return you earn from owning a stock at today’s price, ignoring any capital gains. It is a core input for STOXX’s dividend-weighted and high-dividend indices.

Related terms


Duration (Bond)

▰▰▰▰▰ 892

Quote

“Duration is the single most important tool for measuring and managing interest rate risk in a bond portfolio.”

Frank J. Fabozzi, Bond Markets, Analysis, and Strategies (1989)

A measure of the sensitivity of a bond’s price to changes in interest rates, expressed in years. Modified duration estimates the percentage price change for a 1% change in yield; Macaulay duration is the weighted average time to receive the bond’s cash flows.

Note

Duration is the bond investor’s most important risk number. A duration of 5 years means that if interest rates rise by 1%, the bond’s price falls by approximately 5%. Longer-duration bonds are more sensitive to rate changes.

Where is the cash flow at time and is the yield to maturity.

Related terms


Drawdown

▰▰▰▰ 59

Quote

“The first rule of investment is don’t lose, and the second rule is don’t forget the first rule.”

Warren Buffett

The peak-to-trough decline of an investment or index, measured from the highest value to the subsequent lowest value before a new peak is established. Drawdown is expressed as a percentage loss.

Note

Drawdown captures how far an investment fell from its best point before recovering. It answers the question: “If I bought at the worst time, how bad would the ride down have been?”

Where is the value at time and is the highest value prior to .

Related terms


E

Earnings Per Share (EPS)

▰▰▰▰ 77

Quote

“Earnings can be as pliable as putty when a charlatan heads the company reporting them.”

Warren Buffett

The portion of a company’s net income allocated to each outstanding share of common stock. It is the most widely used single measure of corporate profitability and serves as the denominator of the P/E ratio.

Note

EPS is the bottom-line number that drives most valuation conversations. When analysts say a company “beat earnings,” they typically mean actual EPS exceeded the consensus forecast. STOXX uses EPS in value/growth style classification.

Related terms


Earnings Yield

▰▰▰ 31

Quote

“Earnings are the lifeblood of every enterprise.”

Anonymous

The ratio of earnings per share to the current share price, equivalent to the inverse of the price-to-earnings ratio. Used as a value factor in STOXX and ISS index construction.

Note

Earnings yield expresses how much profit a company generates for every dollar of its stock price. It flips the familiar P/E ratio to make comparisons with bond yields more intuitive.

Related terms


EBITDA

▰▰▰▰ 52

Quote

“EBITDA makes even a lemonade stand look like a Fortune 500 company.”

Charlie Munger (paraphrased), Poor Charlie’s Almanack (2005)

Earnings Before Interest, Taxes, Depreciation, and Amortization. A proxy for a company’s operating cash flow that strips out financing decisions, tax jurisdiction effects, and non-cash accounting charges, enabling comparisons across firms with different capital structures.

Note

EBITDA is the analyst’s favourite shortcut for “how much cash does the core business throw off?” It is the denominator of the widely used EV/EBITDA valuation multiple and a key input to credit analysis.

Or equivalently:

Related terms


Economic Value Added (EVA)

▰▰▰▰ 56

Quote

“EVA is the financial performance measure that comes closer than any other to capturing the true economic profit of an enterprise.”

G. Bennett Stewart III, The Quest for Value (1991)

A proprietary measure of a company’s financial performance defined as after-tax operating profit minus a charge for the capital employed to generate that profit. EVA quantifies whether a firm is creating or destroying shareholder value.

Note

EVA asks a simple question: did the company earn more than the cost of the money it used? If EVA is positive, the business is generating wealth beyond what investors could have earned elsewhere at the same risk.

Related terms


EVA Margin

▰▰▰ 43

The ratio of Economic Value Added to revenue, indicating how much economic profit a company earns per unit of sales. It adjusts for both operating efficiency and capital efficiency.

Note

EVA Margin tells you what fraction of each sales dollar turns into true economic profit after accounting for the full cost of capital. It rewards companies that are both operationally lean and capital-light.

Related terms


Equity Risk Premium

▰ 2

Quote

“The equity premium is the most important number in finance.”

Rajnish Mehra, The Equity Premium Puzzle (1985)

The expected return of the broad equity market in excess of the risk-free rate. It represents the additional compensation investors demand for bearing systematic market risk.

Note

The equity risk premium is the extra reward you expect for putting money in stocks instead of risk-free government bonds. It is a key input to CAPM and drives the calculation of alpha and beta.

Related terms


Enterprise Value (EV)

▰▰▰▰ 84

Quote

“Enterprise value captures the total claim on a business — equity plus debt minus cash — and is the only honest starting point for valuation.”

Aswath Damodaran, The Little Book of Valuation (2011)

The total value of a company as seen by all capital providers — equity holders, debt holders, and minority interests — minus cash and equivalents. It represents the theoretical takeover price and is the numerator in capital-structure-neutral valuation multiples like EV/EBITDA.

Note

Enterprise value gives you the full price tag of a business, not just the equity slice. It is preferred over market capitalisation when comparing companies with different debt levels because it puts them on an equal footing.

Related terms


F

Factor Exposure

▰▰▰▰▰ 292

Quote

“Returns are driven by systematic exposure to compensated risk factors.”

Eugene Fama

The sensitivity of a portfolio or index to a specific systematic return driver (factor) such as value, momentum, size, or volatility. Measured as the loading coefficient in a factor regression model.

Note

Factor exposure quantifies how much a portfolio tilts towards a particular characteristic. A high momentum exposure, for example, means the portfolio is heavily loaded with stocks that have been rising.

Where is the exposure of asset to factor , and is the factor return.

Related terms


Factor Return

▰▰▰ 26

Quote

“Differences in expected returns across securities are driven by differences in their exposure to systematic risk factors.”

Eugene Fama & Kenneth French, Common Risk Factors in the Returns on Stocks and Bonds (1993)

The return attributable to a specific systematic factor over a given period. It represents the payoff to a long-short portfolio that is long stocks with high exposure to the factor and short stocks with low exposure.

Note

Factor return measures how much a particular investment style (e.g., value, momentum) paid off during a period. When the value factor return is positive, cheap stocks outperformed expensive ones.

Related terms


Free Cash Flow (FCF)

▰▰ 11

Quote

“Cash flow is a fact; profit is an opinion.”

Alfred Rappaport, Creating Shareholder Value (1986)

The cash generated by a company’s operations after deducting capital expenditures necessary to maintain or expand its asset base. FCF represents the cash available to pay dividends, reduce debt, buy back shares, or fund acquisitions.

Note

Free cash flow is the ultimate reality check: no matter what the income statement says, FCF shows how much actual cash the business produced. Companies can manipulate earnings, but cash is cash.

Related terms


G

Gross Margin

▰▰ 8

The percentage of revenue remaining after subtracting the cost of goods sold (COGS). It measures how efficiently a company converts raw materials and direct labour into revenue before operating expenses.

Note

Gross margin reveals the basic economics of a company’s product or service. A high gross margin means the company has pricing power or a low-cost production advantage, leaving more room for operating expenses and profit.

Related terms


Gross Profitability

▰▰▰ 22

Quote

“Profitability is coming from productivity, efficiency, management, austerity, and the way to manage the business.”

Carlos Slim

The ratio of gross profit (revenue minus cost of goods sold) to total assets. Introduced by Novy-Marx (2013) as a quality factor, it measures how efficiently a firm converts its asset base into profit before overhead costs.

Note

Gross profitability strips away everything except the most fundamental question: how much raw profit does the company squeeze out of every dollar of assets? It tends to identify high-quality firms.

Related terms


Gross Return

▰▰▰▰▰ 687

Quote

“What you keep after taxes and fees matters more than what you earn before them.”

Anonymous

The total return of an index calculated assuming dividends are reinvested at the gross amount, before any withholding tax is deducted. This represents the theoretical maximum return for a tax-exempt investor.

Note

Gross return shows what you would earn if every dividend were reinvested in full with zero tax. It is the upper bound of performance and is used as the standard total return variant for many STOXX indices.

Related terms


I

Information Ratio

▰▰ 8

Quote

“The information ratio is the key measure of a portfolio manager’s skill.”

Richard Grinold, Active Portfolio Management (1999)

The ratio of a portfolio’s active return to its tracking error. It measures the consistency with which a manager outperforms the benchmark per unit of active risk taken.

Note

The information ratio is the active manager’s report card: it tells you how much excess return they delivered for every unit of uncertainty they introduced by deviating from the benchmark. Higher is better.

Where is the tracking error (standard deviation of active returns).

Related terms


iNAV (Intraday Net Asset Value)

▰ 1

The estimated per-share value of an exchange-traded fund (ETF) or index fund calculated and disseminated continuously throughout the trading day, based on the real-time prices of the fund’s underlying holdings.

Note

iNAV gives traders a live fair-value estimate of an ETF so they can judge whether the market price represents a premium or discount. STOXX calculates iNAV for numerous ETFs tracking its indices.

Where is the number of shares of constituent and is its price at time .

Related terms


M

Maximum Drawdown

▰ 5

Quote

“Rule No. 1: Never lose money. Rule No. 2: Never forget Rule No. 1.”

Warren Buffett

The largest peak-to-trough decline observed over a specified time period. It quantifies the worst-case loss scenario an investor would have experienced.

Note

Maximum drawdown is the single scariest number in a fund’s history: the worst cumulative loss from a peak before a recovery. It matters because investors feel losses more acutely than equivalent gains.

Related terms


Momentum (Price Momentum)

▰▰▰▰▰ 687

Quote

“The trend is your friend until the end when it bends.”

Ed Seykota

The tendency of securities that have performed well (poorly) over a recent period to continue performing well (poorly) in the near future. In index construction, momentum is typically measured as the total return over the past 6 to 12 months, often excluding the most recent month.

Note

Momentum captures the market’s tendency to trend. STOXX momentum indices select stocks with the strongest recent price performance, betting that winners keep winning for a while.

Commonly using a 12-month lookback with a 1-month skip.

Related terms


N

Net Return

▰▰▰▰▰ 447

Quote

“It is not what you earn but what you keep that determines your wealth.”

Anonymous

The total return of an index calculated by reinvesting dividends after deducting the maximum applicable withholding tax rate for non-resident institutional investors. It provides a more realistic return measure for cross-border investors.

Note

Net return is the after-tax version of total return. It reflects what a foreign institutional investor would actually receive after dividend withholding taxes are taken, making it the most commonly benchmarked return variant.

Where is the applicable withholding tax rate for constituent .

Related terms


Net Income

▰▰▰▰ 73

The total profit of a company after all expenses, taxes, interest, and depreciation have been subtracted from revenue. It is the “bottom line” of the income statement and the starting point for EPS calculation.

Note

Net income is the final profit number that flows to shareholders. While not as clean as EVA or free cash flow for analytical purposes, it remains the most widely reported profitability metric and anchors the P/E ratio.

Related terms


Operating Margin

▰ 1

The ratio of operating income (revenue minus operating expenses) to revenue, expressed as a percentage. It measures the proportion of revenue left after covering the costs of production and day-to-day operations, but before interest and taxes.

Note

Operating margin isolates the profitability of the core business, stripping away financing and tax effects. It is one of the key quality metrics used in STOXX factor index construction and ISS governance screening.

Related terms


P

PEG Ratio

▰ 2

Quote

“Growth at a reasonable price is the investor’s holy grail.”

Peter Lynch (paraphrased), One Up on Wall Street (1989)

The price-to-earnings ratio divided by the expected earnings growth rate. It adjusts the P/E ratio for growth, helping investors determine whether a stock’s valuation is justified by its earnings growth trajectory.

Note

PEG attempts to answer a question P/E alone cannot: “Is this high-P/E stock expensive, or is it just growing fast?” A PEG of 1.0 is often cited as fair value; below 1.0 suggests the stock may be undervalued relative to its growth.

Related terms


Price-to-Earnings Ratio

▰ 2

Quote

“The intelligent investor should recognize that market prices reflect a price-earnings ratio, and the question is whether that ratio is justified by the company’s prospects.”

Benjamin Graham, The Intelligent Investor (1949)

The ratio of a company’s current share price to its earnings per share (EPS). It indicates how much investors are willing to pay for each unit of earnings and is a primary valuation metric in STOXX value and growth index classification.

Note

P/E is the most widely quoted valuation metric. A high P/E suggests investors expect strong future growth; a low P/E may indicate undervaluation or declining prospects.

Related terms


R

Realized Volatility

▰▰▰ 24

Quote

“Volatility is the price of admission for long-term returns.”

Nick Murray, Simple Wealth, Inevitable Wealth (1999)

The actual historical volatility of an asset or index, computed as the standard deviation of returns over a past observation window. It is distinguished from implied volatility, which is forward-looking and derived from options prices.

Note

Realized volatility looks backward to measure how bumpy the ride actually was. STOXX uses it to construct minimum-variance and low-volatility indices that favour calmer stocks.

Where are daily log returns and 252 is the standard annualization factor.

Related terms


Return on Assets (ROA)

▰▰ 13

The ratio of net income to total assets, measuring how efficiently a company uses its entire asset base to generate profit. It is a key profitability metric in quality factor screening.

Note

ROA answers: “For every dollar of assets the company controls, how many cents of profit does it produce?” It penalises asset-heavy businesses and rewards capital-light models, making it a useful complement to ROE.

Related terms


Return on Equity (ROE)

▰▰▰▰ 63

Quote

“A truly great business must have an enduring moat that protects excellent returns on invested capital.”

Warren Buffett

The ratio of net income to shareholders’ equity, measuring how effectively a company generates profit from the money shareholders have invested. It is one of the most watched profitability metrics in equity analysis.

Note

ROE tells you the return earned on the owners’ stake in the business. High ROE can signal a competitive advantage, but it can also be inflated by excessive leverage, so it should be read alongside the debt-to-equity ratio.

Related terms


Revenue

▰▰▰▰▰▰ 3,843

Quote

“Nothing happens until someone sells something.”

Peter Drucker (attributed), The Practice of Management (1954)

The total amount of income generated by the sale of goods or services related to a company’s primary operations, before any expenses are deducted. Also referred to as “top line” or “sales.”

Note

Revenue is the starting point of every profitability calculation. While it says nothing about whether the company is profitable, sustained revenue growth is a prerequisite for long-term value creation and is a key input to STOXX growth factor screens.

Revenue is reported as an absolute currency figure and does not have a ratio formula per se. Growth is commonly expressed as:

Related terms


Risk-Adjusted Return

▰▰▰ 35

Quote

“The essence of investment management is the management of risks, not the management of returns.”

Benjamin Graham, The Intelligent Investor (1949)

A return metric that accounts for the amount of risk taken to achieve it. Common expressions include the Sharpe ratio, Sortino ratio, and information ratio.

Note

Raw returns can be misleading if one fund took enormous risk to achieve them. Risk-adjusted return normalizes performance by the volatility or downside risk endured, enabling fair comparisons.

This is the general form (Sharpe ratio). Alternative specifications replace with downside deviation (Sortino) or tracking error (Information ratio).

Related terms


Risk-Free Rate

▰▰▰ 27

Quote

“There is no such thing as a risk-free investment, only a risk-free rate of return.”

Anonymous

The theoretical rate of return on an investment with zero risk of financial loss, typically proxied by the yield on short-term government securities such as U.S. Treasury bills or German Bunds. It serves as the baseline against which all risky investments are measured.

Note

The risk-free rate is the anchor of modern portfolio theory. Every risk premium, every Sharpe ratio, and every CAPM calculation starts by subtracting this rate. In practice, it shifts with central bank policy and sovereign credit conditions.

The risk-free rate is observed from government bond yields rather than calculated from a formula. It is commonly denoted:

Related terms


Sharpe Ratio

▰▰▰▰ 60

Quote

“The reward-to-variability ratio provides a single measure combining both risk and return.”

William Sharpe

The ratio of a portfolio’s excess return over the risk-free rate to its total standard deviation. Developed by William Sharpe, it is the most widely used measure of risk-adjusted performance.

Note

The Sharpe ratio asks: “For every unit of total volatility I endured, how much extra return did I get beyond the risk-free rate?” Values above 1.0 are generally considered good; above 2.0, excellent.

Related terms


Standard Deviation

▰▰▰▰▰ 300

Quote

“Diversification is both observed and sensible; a rule of behavior which does not imply the superiority of diversification must be rejected both as a hypothesis and as a maxim.”

Harry Markowitz, Portfolio Selection (1952)

A statistical measure of the dispersion of returns around their mean. In finance, it serves as the primary measure of total risk (volatility).

Note

Standard deviation tells you how spread out an investment’s returns are. A higher standard deviation means wider swings in value and therefore greater uncertainty about future outcomes.

Related terms


Spread (Credit)

▰▰▰▰▰ 752

Quote

“The spread tells you the market’s level of fear.”

Anonymous

The difference in yield between a corporate bond (or other credit instrument) and a risk-free government bond of comparable maturity. It compensates the investor for default risk, liquidity risk, and other credit-related uncertainties.

Note

Credit spread is the market’s real-time verdict on a borrower’s riskiness. When spreads widen, investors are demanding more compensation for the perceived risk of default; when they tighten, confidence is rising.

Typically expressed in basis points.

Related terms


T

Total Return

▰▰▰▰▰ 334

Quote

“Never count just the dividends or just the price. Count everything.”

Anonymous

The complete return on an investment including both price appreciation and income from dividends or interest, assuming all distributions are reinvested. STOXX publishes total return indices in both gross and net variants.

Note

Total return captures the full picture: not just whether the stock price went up, but also the dividends you collected along the way. It is the only honest way to evaluate long-term investment performance.

Where is the price at time and is the dividend received.

Related terms


Tracking Error

▰▰▰▰▰ 501

Quote

“Tracking error is the fundamental measure of active risk — it tells you how far a portfolio dares to stray from its benchmark.”

Richard Grinold & Ronald Kahn, Active Portfolio Management (1999)

The standard deviation of the difference between a portfolio’s returns and its benchmark’s returns. It measures the consistency of a portfolio’s deviation from its benchmark, also known as active risk.

Note

Tracking error quantifies how tightly a fund follows its benchmark. An index-tracking ETF should have near-zero tracking error; an active manager with high conviction will have a large one.

Related terms


Turnover

▰▰▰▰▰ 668

Quote

“Costs eat returns the way termites eat wood: slowly, silently, and from within.”

John C. Bogle (paraphrased), The Little Book of Common Sense Investing (2007)

In index methodology, the proportion of an index’s weight that changes at each rebalancing, reflecting the cost of maintaining the portfolio. It is typically expressed as one-way turnover (the sum of additions or deletions, not both).

Note

Turnover measures how much trading an index forces at each rebalance. Higher turnover means higher transaction costs and potential tax consequences for funds tracking the index.

Related terms


V

Value at Risk (VaR)

▰▰▰ 45

Quote

“The problem with VaR is that it tells you nothing about what happens in the tail.”

Nassim Nicholas Taleb, The Black Swan (2007)

The maximum expected loss of a portfolio over a specified time horizon at a given confidence level. For example, a one-day 95% VaR of $1 million means there is a 5% probability of losing more than $1 million in a single day.

Note

VaR puts a dollar figure on potential losses. It answers: “On 95 out of 100 days, I expect to lose no more than this amount.” It does not, however, tell you how bad things could get in the remaining 5 days.

Under the parametric (normal) assumption:

Where is the z-score at confidence level .

Related terms


Volatility

▰▰▰▰▰▰ 2,756

Quote

“Uncertainty is the only certainty there is.”

John Allen Paulos, A Mathematician Plays the Stock Market (2003)

A general term for the degree of variation in a trading price series over time. In quantitative finance, it is most commonly measured as the annualized standard deviation of returns.

Note

Volatility is the heartbeat of financial markets. Low volatility means calm, predictable price action; high volatility means wild swings. STOXX uses it to build minimum-variance and low-volatility indices.

Related terms


W

Weighted Average

▰▰▰▰ 165

Quote

“Not all things are created equal, nor should they be counted equally.”

Anonymous

A calculation in which each constituent’s value is multiplied by its index weight before summation, producing an aggregate that reflects the relative importance of each component. Used extensively in index-level statistics such as weighted-average P/E, dividend yield, and market capitalisation.

Note

A simple average treats all stocks equally; a weighted average gives larger stocks more influence. Nearly every aggregate index statistic you see — average P/E, average yield, average beta — is a weighted average.

Related terms


Y

Yield Curve

▰▰ 9

Quote

“Interest rates are to asset prices what gravity is to the apple.”

Warren Buffett

A graphical representation of the relationship between bond yields and their maturities, typically for government securities. A normal (upward-sloping) curve indicates that longer-term bonds pay higher yields; an inverted curve, where short-term rates exceed long-term rates, has historically been a recession predictor.

Note

The yield curve is one of the most watched indicators in finance. Its shape reflects market expectations about future interest rates, inflation, and economic growth. STOXX fixed-income indices are segmented by maturity buckets that correspond to different points on the curve.

The yield curve is an empirical observation rather than a single formula. The term structure can be modelled as:

This is the Nelson-Siegel model, where is the long-run level, captures slope, captures curvature, and is a decay parameter.

Related terms


Disclaimer

Definitions are synthesised from publicly available STOXX and ISS Governance documentation for educational purposes. Always consult the latest official methodology guides for authoritative specifications.