ETF NAV vs. market price: premiums, discounts, and your return

Net asset value per share, or NAV, equals fund assets minus liabilities, divided by shares outstanding. It is a valuation, not a standing offer to buy your shares.

The exchange price comes from trading. A last trade, bid, ask, and midpoint can differ, and none automatically equals NAV. A premium means the chosen market price is above NAV; a discount means it is below.

[Investor.gov's ETF overview](https://www.investor.gov/introduction-investing/investing-basics/investment-products/mutual-funds-and-exchange-traded-2) distinguishes exchange prices from NAV.

This guide uses fully paid ETF shares, not options or leveraged account positions. All numbers are invented and use one consistent currency. The arithmetic travels across markets; valuation and trading procedures still depend on the fund.

Premium or discount (%) = (market price ÷ NAV per share − 1) × 100. A positive result is a premium; a negative result is a discount. NAV, rather than market price, is the denominator.

With NAV of 50 and a market price of 51, the premium is (51 ÷ 50 − 1) × 100 = 2%. At a price of 49 against the same NAV, the result is −2%.

Compare the same share class, unit, currency, and valuation time. Dividing a quote in pounds by a NAV in dollars does not measure a premium until a consistent exchange-rate conversion is applied.

A closing-price premium and an intraday ask-price premium answer different questions. Record which price the provider uses before comparing two displayed percentages.

In a separate hypothetical snapshot, NAV is 50, bid is 50.95, and ask is 51.05. The midpoint is 51. Assume the quote can fill the full quantity and stays unchanged during an immediate round trip.

The spread can be small while both sides sit above NAV. A tight spread therefore does not prove the ETF is trading near its stated asset value.

Buying 200 shares at 51.05 costs 10,210; immediately selling at 50.95 returns 10,190. The 20 difference is the unchanged spread effect, not an additional 2% premium loss realized in that round trip.

Actual fills already incorporate their price effects. Do not deduct a modeled spread or premium again from profit calculated using those fills. Separate commissions remain separate charges.

• Midpoint premium: (51 ÷ 50 − 1) × 100 = 2%.
• Ask premium for a buyer: 2.10%; bid premium for a seller: 1.90%.
• Quoted spread relative to midpoint: (51.05 − 50.95) ÷ 51 × 100 ≈ 0.1961%.

Assume a different, distribution-free holding period with no share split, external cash flow, taxes, or broker charges. NAV rises from 50 to 55. The purchase fills at 51 and the sale at 54.45.

The entry premium is 2%. At exit, 54.45 ÷ 55 − 1 = −1%, so the shares sell at a 1% discount. These are hypothetical fills, not midpoint assumptions.

Investor return = 690 ÷ 10,200 ≈ 6.7647%. The result trails the NAV change by about 3.2353 percentage points, not exactly the three points obtained by simply subtracting 2% and 1%.

Let d_entry and d_exit be signed price-to-NAV gaps as decimals. Since price = NAV × (1 + d), the exact no-distribution identity is:

1 + r_price = (1 + r_NAV) × (1 + d_exit) ÷ (1 + d_entry).

Here, 1.10 × 0.99 ÷ 1.02 − 1 ≈ 6.7647%. The formula reconciles endpoint prices; it does not forecast how quickly a premium will disappear.

Distributions require a cash-flow or reinvested total-return calculation instead. Do not combine an adjusted total-return index with raw share prices in this identity.

Use price versus total return for income treatment and ETF tracking measures for benchmark comparisons.

• NAV change: 55 ÷ 50 − 1 = 10%.
• Purchase of 200 shares: 200 × 51 = 10,200.
• Sale proceeds: 200 × 54.45 = 10,890; profit: 690.

Suppose you buy at 49 when NAV is 50: a 2% discount. Later NAV falls to 45 and you sell at 45, exactly at NAV. Ignore distributions and costs again.

The discount has disappeared, but 45 ÷ 49 − 1 ≈ −8.1633%. The underlying NAV decline outweighed the favorable change in the price gap.

Buying below NAV is not the same as buying below a guaranteed future sale price. Test both the asset-value path and the exit premium or discount before calling a discounted ETF a bargain.

Published NAV and a current exchange quote may refer to different moments. An apparent gap can reflect new information arriving after portfolio prices were valued, especially across time zones.

If yesterday's NAV is 50 and today's market price is 51, the displayed comparison gives 2%. It does not establish that today's portfolio is still worth 50.

Where an intraday indicative NAV, or iNAV, is supplied, check its inputs and timestamp too. More frequent calculation does not make unchanged underlying quotes current or turn an estimate into an executable price.

[HKEX's product FAQs](https://www.hkex.com.hk/Global/Exchange/FAQ/Products?sc_lang=en) explain that different trading hours can affect ETF premiums and discounts.

Keep currency conversion separate from the gap itself. ETF trading currency and exposure explains why the quotation currency alone does not identify the underlying risk.

Authorized participants may create or redeem ETF shares using baskets or cash. These transactions can help align the exchange price with underlying value; they do not promise every retail trade will execute at NAV.

[iShares explains this mechanism](https://www.ishares.com/us/investor-education/etf-education/etf-premiums-and-discounts). A redemption route used by a large institution is not the same as an ordinary exchange sell order.

A visible gap alone does not establish executable arbitrage. Basket access, transaction costs, market closures, and changes while trading all need examination. Do not assume convergence by a particular date.

A limit order controls an acceptable execution price, not the accuracy of the NAV reference or the certainty of a fill. A stale reference can produce an unsuitable limit just as it can produce a misleading premium.

[Investor.gov's execution guide](https://www.investor.gov/introduction-investing/investing-basics/how-stock-markets-work/executing-order) explains why displayed prices need not be your fills.

Save a comparison that another reader could reproduce. Separate the question of price alignment from whether the fund's exposure is appropriate for the investment goal.

[Vanguard's trading guidance](https://www.vanguard.co.uk/professional/vanguard-365/investment-knowledge/etf-knowledge/what-are-some-of-the-best-practices-for-trading-ETFs) covers timing and liquidity. [!TRYMARK] TryMark ETF valuation checkpoint Before the next order, target a same-currency, time-matched price comparison. Recalculate when the bid, ask, valuation timestamp, underlying-market status, or intended quantity changes. [!WARNING] A discount is not downside protection A discounted ETF can fall further, and the discount can widen. This guide explains pricing arithmetic, not a guaranteed arbitrage, product recommendation, or universal safe premium threshold.

• Record the share class, trading line, units, and currency conversion used.
• Label each price as bid, ask, midpoint, last trade, or actual fill, with its time.
• Record the NAV or iNAV timestamp and whether relevant underlying markets are open.
• Inspect quoted size, both sides of the market, and fund notices about trading or creations.