NISA Investment Advisors is an investment advisory firm. Its investment management services include institutional tax-exempt, fixed-income management and institutional taxable fixed-income and equity management. It specializes in asset management and trust services that include estate and financial planning, tax preparation, custody and philanthropic advisory services. Its clients include defined-benefit and stable-value plan sponsors, corporations, insurance companies, foundations and endowments. The firm also provides taxable asset management services for various clients, including nuclear decommissioning trusts, insurance companies and voluntary employees beneficiary associations. It reconciles tax lot information, book value of individual bond positions, and realized and unrealized gains and losses with the clients recordkeepers. NISA Investment Advisors is located in St. Louis.