Nuveen California Select Tax-Free Income Portfolio is a closed-ended fixed income mutual fund investing in the fixed income markets of California. The fund primarily invests in municipal bonds and uses fundamental analysis to create its portfolio, benchmarking its performance against Barclays Capital California Municipal Bond Index and S&P California Municipal Bond Index. Co-managed by Nuveen Fund Advisors LLC and Nuveen Asset Management, LLC, the fund was formed on June 19, 1992 and is domiciled in the United States.