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ETF (Exchange-Traded Fund)

An ETF is a fund whose shares trade on an exchange. It may track an index or follow an active strategy; price, NAV, costs, replication and liquidity must be assessed separately.

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In plain language — When you buy an ETF share, you hold an interest in a fund. The fund may own stocks, bonds or other instruments; you are not buying the index written in its name directly.

An ETF (Exchange-Traded Fund) is a fund whose shares trade on an exchange during the trading day. It pools capital from multiple investors in a portfolio defined by the fund's objective, policy and documents.

Many ETFs seek to track a market index, but ETF and index fund are not synonyms: actively managed ETFs and unlisted index funds both exist. Legal structure, protections and terminology depend on the jurisdiction; the prospectus always takes precedence over the commercial label.

Primary and secondary markets

The mechanism has two levels.

Shares traded by investors

In the secondary market, investors buy and sell shares at the price available on the exchange, as they do with stocks. The price may be slightly above or below the per-share value of the portfolio.

Creation and redemption

In the primary market, specialised firms often called Authorized Participants may create or redeem large blocks of shares by delivering or receiving a basket of securities and/or cash under the fund's rules. This mechanism enables arbitrage between the share price and portfolio value, but does not guarantee that premiums or discounts will always be zero, particularly under stress.

In simplified form, NAV (Net Asset Value) per share is:

NAV per share = (fund assets − liabilities) / shares outstanding

NAV is calculated under the fund's rules. The market price instead arises from orders on the execution venue.

premium/discount = (market price − NAV) / NAV

A positive value is a premium; a negative value is a discount. For assets that trade at different times, are illiquid or are valued using estimates, an instantaneous comparison may be less straightforward than the formula suggests.

How it obtains exposure

Method Description Points to verify
Full physical replication the fund holds all or nearly all index components costs, securities lending, rebalancing
Sampling it holds a subset constructed to replicate the basket tracking and deviations
Synthetic replication it uses derivatives, often swaps, to obtain the return counterparty, collateral, contract terms
Active management the manager selects the portfolio within the mandate process, costs, concentration, deviation from benchmark

“Physical” does not mean risk-free, and “synthetic” does not automatically mean unsuitable. They are different structures requiring different checks.

ETFs may also distribute income or reinvest it, depending on the share class. Trading currency, fund currency and the currencies of the underlying assets are three distinct pieces of information.

ETF, ETC, ETN and ETP

ETP is an umbrella term for exchange-traded products. Commercially similar names may conceal different legal structures:

  • an ETF is a fund share;
  • an ETN is normally an issuer debt security linked to an index or benchmark;
  • an ETC, in the European market, may be a secured or unsecured security providing commodity exposure;
  • other ETPs may use specific vehicles, guarantees or derivatives.

An ETN does not necessarily hold a segregated portfolio like a fund and adds the issuer's credit risk. A ticker and the words “exchange-traded” are not enough to identify the structure.

Return and tracking

For an index-tracking ETF:

tracking difference = ETF return − index return

The difference may arise from costs, taxes, replication, liquidity, rebalancing, securities lending and reinvestment timing. Tracking error instead measures the variability of the deviation over time: it is not the same as the cumulative difference.

The index must also be identified precisely: price-return, gross or net total-return version, currency, calculation time and rebalancing rules may all change the comparison.

Liquidity and costs

Liquidity has at least two layers:

  1. volume, spread and depth in the exchange-traded shares;
  2. liquidity and valuability of the assets held or replicated.

An ETF with little visible trading is not necessarily illiquid if its underlying basket is readily tradable and the creation mechanism functions. Conversely, high volume does not eliminate dislocation risk when the underlying markets are closed or stressed.

Costs include:

  • the fund's ongoing charges;
  • trading commissions;
  • the bid-ask spread and market impact;
  • foreign-exchange costs;
  • taxes and withholding;
  • tracking differences not explained by the headline cost figure alone.

Risks that must not be hidden

  • risk in the underlying assets;
  • geographical, sector or issuer concentration;
  • tracking difference and tracking error;
  • premium/discount and trading halts;
  • closure, merger or index changes affecting the fund;
  • counterparty and collateral in synthetic replication;
  • foreign exchange;
  • securities lending;
  • liquidity under normal and stressed conditions;
  • complexity in leveraged, inverse, single-stock or options-based ETFs.

Leveraged and inverse ETFs often pursue a daily objective. Because of resetting and compounding, their result over several days may diverge substantially from the multiple applied to the benchmark's cumulative return.

A checklist based on the document, not the name

  1. What is the legal structure: ETF, ETN, ETC or another ETP?
  2. Which index or mandate does it follow, and in which version?
  3. Is replication physical, sampled, synthetic or active?
  4. What are the portfolio, concentrations and securities-lending policy?
  5. Is the share class accumulating or distributing?
  6. What are the NAV, spread, historical premiums/discounts and underlying market hours?
  7. Which direct and indirect costs accumulate?
  8. Is there leverage, daily resetting, derivatives or issuer risk?

Sources

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