NXP

Nuveen Select Tax-Free Income Portfolio (NYSE:NXP) is a closed-end municipal bond fund that has been providing tax-free income to investors since its inception on March 19, 1992. Launched by Nuveen Investments Inc., the fund is co-managed by Nuveen Fund Advisors LLC and Nuveen Asset Management, LLC. As a closed-end fund, NXP operates with a fixed number of shares that trade on the stock exchange, distinguishing it from traditional open-end mutual funds that continuously issue and redeem shares at net asset value.