Demystifying ETFs
& Index Funds
Clear, unbiased explanations of how exchange-traded funds and index funds work — no jargon, no sales pitch, no investment advice. Just knowledge.
What You'll Learn Here
We cover the fundamentals of passive investing vehicles — written for clarity, not to sell you anything.
What Are ETFs?
Exchange-traded funds are baskets of securities that trade on stock exchanges. Learn how they're structured, priced, and how they differ from mutual funds.
Learn moreIndex Funds Explained
Index funds track a market benchmark — like the S&P 500 or FTSE 100. Discover why passive index tracking has grown to dominate global asset management.
Learn moreETF vs Index Fund
Though often confused, ETFs and index funds have meaningful differences in structure, taxation, minimum investment, and how they're traded throughout the day.
Learn more
Education Without the Sales Pitch
invseos was created to fill a gap: most ETF and index fund content online is produced by financial institutions with products to sell. We believe that understanding how these instruments work should come first — independent of any particular product recommendation.
The Rise of Passive Investing
Understanding the scale of index investing helps contextualise why these instruments matter.
From Index to Investment
At the core of an index fund or ETF is a rules-based index — a list of securities selected by objective criteria. Fund managers then hold those securities in proportion to their weight in the index.
An index is defined
An index provider like S&P Global sets the rules — which companies qualify, how they're weighted, and when the index rebalances.
A fund mirrors the index
The fund buys the securities in the index in proportion to each constituent's weight, aiming to replicate returns before costs.
Investors buy shares
ETF shares are bought and sold on exchanges just like stocks. Index fund units are typically purchased once daily at the net asset value price.
Start With Our Complete ETF Guide
Everything you need to understand how ETFs and index funds work — in plain English, completely free.
Read the Guide