Two listed products can hold identical vaulted gold and still behave differently on the exchange. The structural difference is whether new shares can be created on demand.
Open-ended funds expand and contract
An open-ended exchange-traded product allows large institutional participants to create new shares by delivering metal, or to redeem shares and receive metal back.
That process is continuous and available whenever a gap opens between the share price and the value of the metal per share.
The result is that the market price stays close to the underlying metal value, because any meaningful deviation is profitable for someone to close.
Closed-end trusts have a fixed share count
A closed-end structure issues shares once and does not routinely create more. Investors who want in must buy existing shares from someone willing to sell.
Nothing forces the share price to match the metal value. If demand exceeds supply, shares trade above it; if sentiment sours, they trade below.
Those deviations are called premiums and discounts, and they can persist for extended periods rather than closing quickly.
The discount is a second variable
A holder of a closed-end trust is exposed to both the metal price and the market's willingness to pay for that particular vehicle.
Metal can rise while the discount widens, leaving the shareholder worse off than the metal move alone implies. The reverse can happen too.
Understanding a closed-end position therefore requires tracking two things, whereas an open-ended fund's price largely tracks one.
Some trusts allow physical redemption
Certain closed-end metal trusts permit unitholders to redeem for physical bullion, subject to minimum quantities that usually amount to whole bars and to delivery charges.
That feature puts a soft floor under a discount, since a large enough holder could redeem metal and sell it directly rather than accept a depressed share price.
The minimums are high enough that this discipline works through institutional holders rather than through retail ones.
Fees and taxation sit on different footings
Both structures charge ongoing management and storage costs, which reduce the metal backing each share slowly over time regardless of price movement.
The two are also organized differently for American tax purposes, and treatment can turn on the specific structure and on an investor's own circumstances.
Because those rules vary and change, the classification of a particular product is a question for the fund's own documents and a qualified professional rather than a general article.