Glossary · 29 terms
ETFs & Index Funds
All etfs & index funds terms in the EquitiesAmerica.com glossary — plain-English definitions for American investors.
Active ETF(actively managed ETF)
An active ETF is an exchange-traded fund in which a portfolio manager makes discretionary or systematic decisions about which securities to hold and in what proportions, rather than mechanically tracking a predetermined index, combining the tax efficiency and intraday tradability of the ETF structure with the flexibility of active portfolio management.
Authorized Participant(AP)
An authorized participant (AP) is a large financial institution — typically a major bank or market maker — that has a contractual agreement with an ETF issuer to create or redeem large blocks of ETF shares directly with the fund.
Bond ETF(fixed-income ETF)
A bond ETF is an exchange-traded fund that holds a portfolio of bonds — government, corporate, municipal, or a blend — and trades on a stock exchange, providing fixed-income exposure with stock-like liquidity.
Buffer ETF(buffered ETF)
A buffer ETF — also called a defined outcome ETF or buffered outcome ETF — is an exchange-traded fund that uses options contracts to limit the investor's downside loss within a specific range (the buffer) while capping upside participation, all within a defined outcome period, typically one year.
Business Development Company(BDC)
A Business Development Company (BDC) is a publicly registered closed-end investment company that provides debt and equity financing to small and mid-sized US businesses, offering retail investors access to private credit and private equity-style returns through a publicly listed or non-traded vehicle.
Closed-End Fund(CEF)
A Closed-End Fund (CEF) is a publicly traded investment company that raises a fixed amount of capital through an initial public offering, issues a set number of shares that then trade on an exchange like a stock, and does not continuously issue or redeem shares at net asset value.
Commodity ETF(commodity fund)
A commodity ETF is an exchange-traded fund that provides exposure to raw materials — such as gold, silver, oil, natural gas, or agricultural products — either by holding the physical commodity directly, by investing in commodity futures contracts, or by holding shares of commodity-related companies.
Creation Unit
A creation unit is a large, fixed block of ETF shares — typically 25,000 to 100,000 shares — that authorized participants exchange with ETF issuers in the in-kind creation and redemption process.
Currency-Hedged ETF(FX-hedged ETF)
A currency-hedged ETF is an international exchange-traded fund that uses forward foreign exchange contracts to neutralize the effect of currency fluctuations between the U.S. dollar and the currencies of the countries where the fund's holdings are traded, so that the U.S. investor's return reflects only the local-market performance of the underlying stocks.
Defined Outcome ETF(structured outcome ETF)
A defined outcome ETF is a broader category of exchange-traded fund that uses derivatives to deliver a pre-specified return profile over a set investment period, including buffer ETFs, accelerated return ETFs, and barrier ETFs, all of which offer investors a structured payoff tied to an underlying index rather than direct market exposure.
Dividend ETF(dividend income ETF)
A dividend ETF is an exchange-traded fund that tracks an index of stocks selected and/or weighted based on dividend characteristics — such as dividend yield, dividend growth history, or dividend quality — providing investors with regular income distributions and exposure to dividend-paying companies.
Emerging Market ETF(EM ETF)
An emerging market ETF is an exchange-traded fund that invests in the stocks of companies domiciled in developing economies — such as China, India, Brazil, South Korea, Taiwan, and Mexico — offering U.S. investors exposure to higher-growth markets alongside elevated political, currency, and liquidity risks.
ETF Tax Efficiency(ETF tax advantage)
ETF tax efficiency refers to the structural advantage of the exchange-traded fund format over mutual funds in avoiding taxable capital gains distributions, achieved primarily through the in-kind creation and redemption mechanism that allows the fund to exchange low-cost-basis securities for new shares without triggering a taxable sale inside the fund.
ETF Wrap Fee(advisory fee)
An ETF wrap fee is an all-inclusive advisory or platform fee charged by a financial advisor, robo-advisor, or investment platform on a portfolio invested in ETFs, layered on top of the ETFs' own internal expense ratios, representing the total cost of a managed ETF portfolio solution.
Exchange-Traded Fund(ETF)
An exchange-traded fund (ETF) is an investment fund that holds a basket of securities and trades on a stock exchange throughout the day, just like an individual stock.
Expense Ratio(management expense ratio)
The expense ratio is the annual fee that a fund charges shareholders, expressed as a percentage of average assets under management, covering the cost of operating the fund.
Index Fund(passive fund)
An index fund is a type of investment fund designed to replicate the performance of a specific market index, such as the S&P 500, by holding the same securities in the same proportions.
International ETF(foreign ETF)
An international ETF is an exchange-traded fund that provides U.S. investors with exposure to stocks traded outside the United States, either across developed markets globally, within a specific region such as Europe or the Asia-Pacific, or in a single foreign country.
Interval Fund
An Interval Fund is a registered closed-end investment company that does not trade on a secondary exchange but instead offers periodic repurchase windows — typically quarterly — during which shareholders can tender a limited percentage of their shares at net asset value, providing a middle ground between daily-liquid mutual funds and fully illiquid private funds.
Inverse ETF(short ETF)
An inverse ETF is designed to deliver the opposite of its benchmark's daily return, allowing investors to profit when a market index or sector declines in value.
Leveraged ETF(2x ETF)
A leveraged ETF is a fund that uses financial derivatives and debt to amplify the daily returns of its underlying index, typically by a factor of two or three times.
Net Asset Value(NAV)
Net asset value (NAV) is the per-share value of a fund, calculated by dividing the total value of all assets minus liabilities by the number of outstanding shares.
Sector ETF(sector fund)
A sector ETF is an exchange-traded fund that concentrates its holdings in companies from a specific segment of the economy, such as technology, healthcare, energy, or financials.
Securities Lending (ETF)(stock lending)
Securities lending within an ETF is the practice of temporarily lending the fund's portfolio holdings to short-sellers and other borrowers in exchange for collateral and a lending fee, with a portion of the fee income returned to the fund and its shareholders — partially or fully offsetting the fund's expense ratio.
Smart Beta ETF(factor ETF)
A smart beta ETF is an exchange-traded fund that tracks an index constructed according to rules-based criteria other than market capitalization — such as value, momentum, quality, low volatility, or dividend yield — with the goal of capturing specific return factors or reducing portfolio risk compared to a traditional cap-weighted index fund.
SPY (SPDR S&P 500 ETF)(SPY)
SPY is the ticker symbol for the SPDR S&P 500 ETF Trust, the oldest and most heavily traded ETF in the world, managed by State Street Global Advisors and designed to track the S&P 500 Index.
Thematic ETF(megatrend ETF)
A thematic ETF is an exchange-traded fund that concentrates its holdings in companies linked to a specific investment theme — such as artificial intelligence, clean energy, genomics, cybersecurity, or electric vehicles — rather than tracking a broad market index or sector classification.
Total Return
Total return is the complete gain or loss on an investment over a period, including both price appreciation (or depreciation) and any income received such as dividends or interest payments.
Tracking Error
Tracking error measures how closely an index fund or ETF follows its benchmark index, expressed as the standard deviation of the difference between fund returns and index returns over a given period.