Nuveen AMT-Free Municipal Credit Income Fund is a closed-ended mutual fund co-managed by Nuveen Fund Advisors LLC and Nuveen Asset Management, LLC. It invests in undervalued municipal securities in the US that are exempt from regular federal income taxes and have an average maturity of 17.02 years. The fund employs a fundamental analysis approach and benchmarks its portfolio against S&P Insured Municipal Bond Index.