Nuveen California AMT-Free Municipal Income Fund is a closed-ended fixed income mutual fund launched by Nuveen Investments, Inc. The fund is co-managed by Nuveen Asset Management, LLC and Nuveen Fund Advisors LLC. It invests in the fixed income markets of California, United States. The fund primarily invests in undervalued municipal securities and other related investments the income which are exempt from regular federal and California income taxes and are rated Baa, BBB or higher with an average maturity of 20.17 years. It employs fundamental analysis with a bottom-up approach to create its portfolio. The fund benchmarks the performance of its portfolio against the Standard & Poor's (S&P) California Municipal Bond Index and the S&P National Municipal Bond Index. It was formerly known as Nuveen Insured California Tax Free Advantage Municipal Fund. Nuveen California AMT-Free Municipal Income Fund was formed on November 21, 2002 and is domiciled in the United States.