NYF tracks a market-value-weighted index of investment-grade debt issued by New York governments and agencies, whose interest is not only exempt from federal tax, but New York state tax and AMT as well. Investments must have a minimum term to maturity above one month and have a current outstanding face value of $5 million to qualify. The fund uses a sampling method in tracking the index, which means it will invest in a sample of securities that collectively have an investment profile similar to that of the underlying index. The index is reviewed and rebalanced monthly. Prior to September 15, 2021, the fund tracks the S&P New York AMT-Free Municipal Bond Index.