Everything you need to know about exchange-traded funds — from the share-creation mechanism to how they democratized investing for millions of people.
What exactly is an ETF?
An ETF (Exchange-Traded Fund) is an investment vehicle that combines the benefits of a classic mutual fund with the tradability of a stock. Just like shares of Apple or Microsoft, you can buy or sell it any time during trading hours on an exchange — in real time, at the current market price.
A single ETF share gives you exposure to dozens, hundreds, or even thousands of different securities at once. If you buy one share of VWCE (Vanguard FTSE All-World), you own a tiny slice of roughly 3,700 companies across 47 countries — from Apple to Samsung, from Nestlé to Alibaba.
“ETFs democratized investing — they opened the door to markets that were inaccessible to most investors before 1993.”
The key difference versus a traditional mutual fund is tradability: with a classic fund, you place an order once a day at the NAV (net asset value) calculated at market close. An ETF trades continuously throughout the day, and its price changes in real time based on supply and demand.
A short but turbulent history
It all started with “Black Monday” — October 19, 1987, when stock markets worldwide lost hundreds of billions of dollars in a single day. The U.S. SEC realized the market lacked an instrument that could represent the whole market as one — similar to S&P 500 futures contracts.
This inspired the team at State Street Global Advisors and the American Stock Exchange (AMEX) to develop an entirely new financial product. On January 22, 1993, the bell rang on AMEX and SPY was born — the first ETF in the US, tracking the S&P 500 index.
From a single product with a target AUM of $1 billion grew an industry holding $14.8 trillion in global assets in Q4 2024. The flow of new money into ETFs in 2024 alone broke records — over $1.88 trillion.
How an ETF technically works
Behind the apparent simplicity of an ETF lies an elegant mechanism that ensures the fund’s price never strays far from the actual value of its assets. It’s called the creation / redemption mechanism.
Authorized Participants (APs)
Large financial institutions (banks, market makers) hold special agreements with the ETF provider. In 2024, the average ETF had 18 registered APs, with typically four actively trading.
Creation of new shares
When demand for the ETF is high and its price rises above NAV, an AP buys all the index-constituent shares directly on the market (the "creation basket") and hands them to the provider. In exchange, the provider issues a block of new ETF shares — typically 50,000 at a time.
Redemption of shares
The reverse process: the AP returns a large block of ETF shares to the provider and receives the underlying physical shares from the portfolio. This mechanism naturally keeps the ETF price close to NAV — arbitrage punishes any meaningful spread.
In-kind tax advantage
Because the AP exchanges physical shares (not cash), no capital gains are realized during redemption. This "unintended benefit" of the original SPY design results in significantly better tax efficiency compared to mutual funds.
Practical impact: For the everyday investor, this entire mechanism is invisible. You simply place a buy order through your broker — just like a stock. The AP mechanism works in the background, guaranteeing that the price you pay reflects the actual value of the assets in the portfolio.
Types of ETFs
The ETF market has long outgrown simple stock-index tracking. Today, ETFs exist for practically every asset class.
Track stock indices (S&P 500, MSCI World, sectors). The most widespread type.
Government or corporate bonds. More stable, lower returns. Suitable for the conservative portion of a portfolio.
Gold (GLD), silver, oil, agricultural commodities. GLD holds physical gold in vaults.
Real estate investment trusts. Indirect exposure to commercial real estate with regular dividends.
Technology, healthcare, energy, defense. Higher concentration = higher risk and potential.
Emerging markets, Europe, Asia, single countries. Diversification beyond the US.
A manager actively picks positions. In 2024, they outnumbered passive launches in the US for the first time.
2× or 3× leverage on daily index moves, or short positions. For experienced investors only. Unsuitable for long-term holding.
Fees: where ETFs truly shine
One of the biggest advantages of ETFs is their extremely low cost. TER (Total Expense Ratio) tells you what percentage of the fund’s value you pay annually for management. For passive ETFs, this number is radically lower than for actively managed mutual funds.
Average TER by fund type
The average TER for index equity ETFs fell to 0.15% in 2023 — down from 0.18% in 2019. The cheapest Vanguard ETFs run as low as 0.04%, while the industry average sits at 0.23%.
“A 0.25% difference in TER compounds into hundreds of thousands of dollars in portfolio value over 30 years.”
Actively managed mutual funds typically charge 0.5% to 1.5% annually — and research consistently shows that most of them fail to beat their benchmark after fees, especially over long horizons.
Calculator: what fees cost you over 20 years
Plug in your numbers and see how much the difference between a low-cost ETF and a high-cost active fund really costs you.
* Assumes reinvested returns, before taxes. Actual returns may vary.
Quiz: do you know how ETFs work?
Test what you’ve learned — 5 questions, about 2 minutes.
ETF pros and cons
Like any investment vehicle, ETFs have their upsides and downsides. An honest overview:
| Property | ETF | Active mutual fund |
|---|---|---|
| Annual fee (TER) | ✅ 0.04 – 0.50% | ❌ 0.50 – 2.00%+ |
| Tradability | ✅ Anytime during the trading day | ⚠️ Once daily (NAV) |
| Transparency | ✅ Daily portfolio disclosure | ⚠️ Quarterly / semi-annually |
| Diversification | ✅ Dozens to thousands of securities | ⚠️ Typically dozens |
| Minimum investment | ✅ Price of one share | ⚠️ Usually $100–500+ |
| Tax efficiency | ✅ Higher (in-kind mechanism) | ❌ Lower |
| Bid/ask spread risk | ⚠️ Small but exists | ✅ None |
| Ability to beat the market | ⚠️ Tracks index (by design) | ❌ Most managers fail to beat benchmark |
| Suitable for passive investing | ✅ Ideal | ❌ Less suitable |
← Scroll horizontally to see the full table
What to watch out for: Not all ETFs are cheap — the most expensive ETFs charge over 10% TER annually, while the cheapest are under 0.10%. Always check the TER before buying. Leveraged and inverse ETFs are unsuitable for long-term investing.
How to start investing in ETFs
1. Pick a strategy
The most popular approach for beginners is regular investing (DCA — Dollar Cost Averaging) into a broadly diversified global ETF such as VWCE (Vanguard FTSE All-World) or IWDA (iShares Core MSCI World). Regular monthly contributions eliminate the risk of timing the market badly.
2. Pick a broker
Popular platforms include Interactive Brokers, Schwab, Fidelity, Vanguard, Trade Republic or Trading 212. Key parameters: transaction fees, available ETFs, regulatory framework, support for fractional shares, and DRIP (automatic dividend reinvestment).
3. Check TER and tracking error
Tracking error measures how accurately the ETF tracks its target index. Ideally it should be under 0.1%. Together with TER, it makes up the true cost of your fund.
4. Set up automatic investing
Most brokers let you set up an automatic monthly buy. This discipline — regardless of whether markets rise or fall — is statistically the most successful strategy for retail investors over long horizons.
Assetli tip: On Assetli you can visualize your ETF portfolio, track asset allocation and analyze fund performance in real time — for free.
Sources and references
- EY Global. How ETF trends are shaping market growth and innovation for 2025. July 2025. ey.com
- Clear Street. ETF Trends & Outlook for 2025. March 2025. clearstreet.io
- Investment Company Institute (ICI). ETF Basics and Structure: FAQs. 2024. ici.org
- Vanguard. ETFs — expense ratios and overview. As of December 31, 2025. vanguard.com
- Statista / ICI. Net issuance of ETF shares in the United States 2006–2024. April 2025. statista.com
- Investing.com / Bank of America. How ETFs are remaking the market. December 2024. investing.com
- Ultimus Fund Solutions. How Do Expense Ratios Impact ETFs? November 2024. ultimusfundsolutions.com
- Invoice Fly Academy. Expense Ratio Explained: How Fees Impact Investment Returns. February 2026. invoicefly.com
- Saxo Bank. Expense ratio explained: Why even a small difference matters. 2024. home.saxo
- Charles Schwab. ETFs: Expense Ratios and Other Costs. February 2025. schwab.com
- State Street SPDR. SPY: The original S&P 500 ETF. 2024. ssga.com
- ETF Trends. SPY — The Birth of ETFs and a Whole New Way of Trading. April 2020. etftrends.com
- State Street Global Advisors. How SPY reinvented investing: The story of the first US ETF. January 2023. ssga.com
Disclaimer: This article is for educational purposes only and does not constitute investment advice. Investing carries risk. Past returns do not guarantee future results. Consult a licensed financial advisor before making any investment decisions.
Assetli is an intelligent platform for managing personal finance, investments and household. Our editorial team combines current market research, authoritative sources (EY Global, Investment Company Institute, Vanguard, Charles Schwab, central-bank and regulator publications) and practical experience building financial tools. We write clearly — no marketing fluff, no unnecessary jargon. Every statistic in our articles is backed by a public source you can verify yourself. Important: our articles are for educational purposes only and do not constitute investment advice.
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