Nuveen High Income December 2018 Target Term Fund (the Fund) is a closed-end fund. The Fund's objective is to provide a high level of current income and to return the original of over $9.86 net asset value (NAV) per common share. The Fund will seek to achieve its investment objectives by investing primarily in shorter maturity, high yield (below investment grade) corporate debt securities. The Fund may invest in other types of securities, including senior loans, convertible securities and other types of debt instruments and derivatives that provide comparable economic exposure to the corporate debt market. The Fund's portfolio of investments include aerospace and defense, airlines, automobiles, banks, beverages, chemicals, commercial services and supplies, construction materials, food products, marine and pharmaceuticals, among others. The Fund seeks to identify securities across diverse sectors and industries. Nuveen Fund Advisors, LLC is the investment advisor of the Fund.