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Nuveen Premium Income Municipal Fund 4, Inc. is a closed ended fixed income mutual fund launched by Nuveen Investments Inc. The fund is co-managed by Nuveen Fund Advisors LLC and Nuveen Asset Management, LLC. It invests in the fixed income markets. The fund invests primarily in a portfolio of municipal obligations issued by state and local government authorities or certain U.S. territories. Its investment portfolio comprises of U.S. guaranteed and tax obligations, as well as in various sectors, such as healthcare, utilities, transportation, consumer staples, housing/multifamily, and water and sewer. Nuveen Premium Income Municipal Fund 4 was formed on February 19, 1993 and is domiciled in the United States.