On two separate days last week and again this morning, markets hit critical circuit breaker levels triggering U.S. exchanges to halt trading. Such large market declines remind us of the prospect of an early close if the S&P 500 falls more than 20% from the previous day’s close. If such an event occurs, open-end investment companies (“mutual funds”) will need to either (1) calculate their net asset values (“NAVs”) at the time of the early close or (2) find alternative pricing sources for calculating their NAVs as of 4:00 pm (ET). The options available will depend in part on the mutual fund’s prospectus disclosure.