Portfolio Management Services or PMS, is a service offered by the Portfolio Manager or an asset management company, is an investment portfolio in stocks, fixed income, debt, cash and other securities, managed by a professional fund manager that can potentially be tailored to meet specific investment objectives. Unlike mutual funds, where investors own units of the mutual fund scheme, in a PMS, the investors own individual securities. Although the portfolio managers may oversee hundreds of portfolios, your account may be unique.