An exchange-traded fund is a fund plus a distribution mechanism. The fund is ordinary: a pool of securities, an investment manager, a custodian, a trustee, a daily net asset value. The mechanism is what makes it different, and it involves four parties.
What are the four parties and two markets in an ETF?
The fund issues and cancels units, but only in large blocks called creation units, and only to a short list of counterparties. The authorised participant is one of those counterparties, typically a bank or a large broker, contractually permitted to deliver a basket of securities to the fund and receive units, or to deliver units and receive the basket. The market maker quotes a two-sided price on the exchange all day and manages the resulting inventory; often the same firm plays both roles, and the two functions are worth keeping separate in your head anyway. The investor buys and sells on the exchange from whoever is quoting, and never interacts with the fund at all.
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That produces two markets that operate on different clocks and different economics. The primary market is the fund's own: it transacts in creation units, in kind, at net asset value, and it is open only to authorised participants. The secondary market is the exchange: it transacts in single units, for cash, at whatever price clears, and it is open to everyone. Ninety-something percent of an established fund's daily volume happens in the secondary market and never touches the fund's portfolio at all.
The consequences of that split are worth stating plainly, because they are the wrapper's actual selling points. A seller in the secondary market does not force the fund to sell anything, so a redeeming investor does not impose trading costs on the investors who stayed. When redemption does reach the primary market, it happens in kind, so the fund hands over securities rather than realising gains. And because creation and redemption are open on both sides, the price on the exchange is tethered to the value of the basket by an arbitrage that anyone can run, rather than by a promise anyone has to trust.
The tether is a mechanism, not a law. Everything in the arbitrage band and premium and discount pages is about what happens when the mechanism is impeded.
Creation and redemption, step by step
The fund publishes, before the market opens, a portfolio composition file: the exact list of securities, share counts and any cash component that constitutes one creation unit for that day. Creation-unit sizes vary widely, from a few thousand units to hundreds of thousands, and the size matters because it sets the minimum capital an arbitrage requires.
A creation runs in six steps. The authorised participant reads the composition file and prices the basket at current market levels. It buys the basket, or borrows it, or already holds it. It delivers the basket to the fund's custodian, together with any cash component and the fund's creation fee, which is usually a flat rupee or dollar amount per creation unit rather than a percentage. The fund issues one creation unit's worth of new units to the participant. The participant sells those units on the exchange, or delivers them to a client who wanted size. Settlement follows the local cycle on both legs, which is where the participant's residual risk lives.
Redemption is the same sequence in reverse. The participant accumulates a creation unit's worth of units in the secondary market, delivers them to the fund, and receives the basket, which it then sells or keeps.
Two details do most of the practical work. Cash in lieu covers the securities a participant cannot deliver: a name suspended from trading, a name subject to a foreign-ownership limit, a fractional entitlement. The fund accepts cash instead and buys the security itself, charging the participant for the trouble. A large and persistent cash-in-lieu component is a signal that the basket is hard to source, which usually means the fund's arbitrage band is wide.
Why is the in-kind mechanism tax efficient?
The in-kind mechanism is the source of the wrapper's tax efficiency, in jurisdictions where it works. A fund that meets redemptions by handing over appreciated securities does not realise a gain, so continuing holders are not taxed on someone else's exit. This is a genuine structural advantage where the tax code permits it. It is not universal, it depends on the local treatment of in-kind transfers, and it does nothing at all for the tax the investor pays on their own sale.