What Is an ETF?

A straightforward, factual explanation of exchange-traded funds — what they are, how they work, and the basic terminology.

The Basics

An Exchange-Traded Fund (ETF) is a type of investment fund that holds a collection of assets — stocks, bonds, commodities, or a mix — and trades on a stock exchange just like a regular stock. When you buy a share of an ETF, you are buying a small piece of everything inside it. For example, buying one share of SPY gives you proportional exposure to all 500 companies in the S&P 500 index.

How ETFs Track Indices

Most ETFs are designed to track an index — a predefined list of securities. The S&P 500 is an index of 500 large US companies. The MSCI World is an index of stocks from developed markets worldwide. The ETF buys and holds the securities in the index, so its price moves in line with the index. This is called passive management, and it is how the majority of ETFs operate.

Sector and Thematic ETFs

Not all ETFs track broad markets. Sector ETFs focus on a specific industry — for example, SMH tracks semiconductor companies, XLF tracks financial companies, and URA tracks uranium miners. Thematic ETFs go further, targeting specific trends like clean energy (ICLN), cybersecurity (CIBR), or robotics (RBOT). ETF Radar organizes its tracked ETFs into 6 sector categories so you can quickly find the news feeds relevant to you.

Why News Matters for ETFs

Because ETFs hold baskets of securities, they are affected by any news that impacts their holdings. An earnings report from NVIDIA affects SMH. A Fed interest rate decision affects TLT and AGG. A new trade policy affects broad market ETFs like SPY and VTI. ETF Radar exists to collect and organize this news — automatically pulling articles from financial RSS feeds, filtering out noise, and routing each article to the ETFs it affects.

FAQ

What does ETF stand for?
ETF stands for Exchange-Traded Fund. It is a type of investment fund that trades on stock exchanges, just like individual stocks.
How is an ETF different from a stock?
A stock represents ownership in one company. An ETF holds a basket of many securities (stocks, bonds, commodities) in a single fund. When you buy one share of an ETF, you get exposure to all the holdings inside it.
How is an ETF different from a mutual fund?
Both hold baskets of securities. The main differences: ETFs trade on exchanges throughout the day like stocks, while mutual funds are priced once per day after market close. ETFs generally have lower fees and offer more trading flexibility.
What is an expense ratio?
The expense ratio is the annual fee an ETF charges, expressed as a percentage of assets. For example, a 0.10% expense ratio means you pay $1 per year for every $1,000 invested. This fee is deducted automatically from the fund.
What is an ISIN?
An ISIN (International Securities Identification Number) is a unique 12-character code that identifies a specific security. ETF Radar uses ISINs internally to track and match news to the correct ETFs.

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