Mutual funds and investment trusts are priced on their net asset value (NAV).
NAV looks at the closing prices of the underlying securities each day.
NAV is not always the same thing as price, though. It is used to determine the value of the mutual fund or investment trust, but the trade price could be different because the units may trade at a premium (higher than the NAV) or a discount (lower than the NAV).
It’s important to remember that while NAV is used as a tool to determine price, it doesn't directly indicate the fund’s performance. Total return, which includes capital gains, dividends, interest, and realised distributions, , is a better performance metric.