CMF provides broad exposure to California municipal bonds. The fund only holds USD-denominated debt issued in California that is exempted from US and California income taxes and the alternative minimum tax (AMT). The index adheres to the requirements of its parent, the ICE AMT-Free California Municipal Index, but must have a minimum par amount of $15 million to qualify and have a minimum term to maturity above one month. 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 on a monthly basis. Prior to September 15, 2021, the fund tracks the S&P California AMT-Free Municipal Bond Index.