A third party that provides advice, typically for compensation, on purchases and sales of securities and often on managing investment portfolios, whether on a discretionary or non-discretionary basis. Section 202(a)(11) of the Advisers Act defines an “investment adviser” as “any person who, for compensation, engages in the business of advising others, either directly or through publications or writings, as to the value of securities or as to the advisability of investing in, purchasing, or selling securities, or who, for compensation and as part of a regular business, issues or promulgates analyses or reports concerning securities; but does not include (A) a bank, or any bank holding company as defined in the Bank Holding Company Act of 1956 which is not an investment company; (B) any lawyer, accountant, engineer, or teacher whose performance of such services is solely incidental to the practice of his profession; (C) any broker or dealer whose performance of such services is solely incidental to the conduct of his business as a broker or dealer and who receives no special compensation therefor; (D) the publisher of any bona fide newspaper, news magazine or business or financial publication of general and regular circulation; (E) any person whose advice, analyses, or reports relate to no securities other than securities which are direct obligations of or obligations guaranteed as to principal or interest by the United States, or securities issued or guaranteed by corporations in which the United States has a direct or indirect interest which shall have been designated by the Secretary of the Treasury, pursuant to section 3(a)(12) of the Securities Exchange Act of 1934, as exempted securities for the purposes of that Act; or (F) such other persons not within the intent of this paragraph, as the Commission may designate by rules and regulations or order.”