Net Asset Value

Net asset value is the fundamental pricing metric for investment funds. For traditional mutual funds, NAV is calculated once at the end of each trading day after the markets close, and all buy and sell orders placed during the day are executed at that single price. For ETFs, the NAV is calculated continuously throughout the day and serves as a reference price, though ETF shares actually trade at market prices on exchanges that may differ slightly from NAV.

The formula is conceptually simple: take the current market value of everything the fund owns — stocks, bonds, cash, and any other holdings — subtract any liabilities such as accrued fees or short positions, and divide by the total number of shares outstanding. The result is the NAV per share.

For ETF investors, understanding the relationship between market price and NAV is important. When an ETF trades at a premium, its market price is above NAV, meaning investors are paying slightly more than the underlying basket is worth. When it trades at a discount, the market price is below NAV. Well-arbitraged, highly liquid ETFs like SPY or IVV typically trade within a fraction of a penny of their NAV, because authorized participants continuously exploit any discrepancies. Less liquid or specialty ETFs can trade at wider premiums or discounts, particularly during volatile market sessions.

For mutual fund investors, NAV is especially practical because it is the exact price at which transactions occur. If you place a buy order for a Vanguard mutual fund before the 4:00 PM ET cutoff, you receive that day's closing NAV. Orders placed after the cutoff receive the next business day's NAV.

NAV also serves as a performance benchmark. Comparing a fund's NAV over time, adjusted for any distributions paid out, shows the fund's total return. Tracking how NAV changes relative to an index is one way to measure tracking error and overall fund quality.