What is the main driver of the intraday price of an exchange-traded fund (ETF)?

An ETF trades continuously on a marketplace, so its intraday market price is determined by executable buy and sell orders—effectively, supply and demand on the exchange. When buying pressure exceeds available selling interest, the market price may rise; when selling pressure dominates, it may fall. Consequently, option B identifies the immediate price-formation mechanism.

The ETF’s underlying net asset value remains highly relevant. Authorized participants and market makers can create or redeem ETF units and conduct arbitrage transactions when the market price materially diverges from the value of the underlying portfolio. This process generally helps keep the ETF’s trading price reasonably close to its net asset value, but it does not change the fact that the intraday execution price is established through marketplace bids and offers.

Portfolio rebalancing by the manager may alter the fund’s holdings but is not the direct driver of every intraday trade. Institutional investors can contribute substantial liquidity, but liquidity describes the ability to trade efficiently rather than the fundamental mechanism determining price. Daily valuation of assets under management is generally used to calculate net asset value and does not itself set each intraday exchange price.

CIRO materials distinguish ETF market prices from published NAV and recognize that ETFs may trade temporarily at a premium or discount to underlying value.

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