On March 12, 1975, the Department of Labor issued an interpretive bulletin, ERISA IB 75–3, with regard to its interpretation of section 3(21)(B) of the Employee Retirement Income Security Act of 1974. That section provides that an investment by an employee benefit plan in securities issued by an investment company registered under the Investment Company Act of 1940 shall not by itself cause the investment company, its investment adviser or principal underwriter to be deemed to be a fiduciary or party in interest “except insofar as such investment company or its investment adviser or principal underwriter acts in connection with an employee benefit plan covering employees of the investment company, the investment adviser, or its principal underwriter.”

The Department of Labor interprets this section as an elaboration of the principle set forth in section 401(b)(1) of the Act and ERISA IB 75–2 (issued February 6, 1975) that the assets of an investment company shall not be deemed to be assets of a plan solely by reason of an investment by such plan in the shares of such investment company. Consistent with this principle, the Department of Labor interprets this section to mean that a person who is connected with an investment company, such as the investment company itself, its investment adviser or its principal underwriter, is not to be deemed to be a fiduciary of or party in interest with respect to a plan solely because the plan has invested in the investment company's shares.

This principle applies, for example, to a plan covering employees of an investment adviser to an investment company where the plan invests in the securities of the investment company. In such a case the investment company or its principal underwriter is not to be deemed to be a fiduciary of or party in interest with respect to the plan solely because of such investment.

On the other hand, the exception clause in section 3(21) emphasizes that if an investment company, its investment adviser or its principal underwriter is a fiduciary or party in interest for a reason other than the investment in the securities of the investment company, such a person remains a party in interest or fiduciary. Thus, in the preceding example, since an employer is a party in interest, the investment adviser remains a party in interest with respect to a plan covering its employees.

The Department of Labor emphasized that an investment adviser, principal underwriter or investment company which is a fiduciary by virtue of section 3(21)(A) of the Act is subject to the fiduciary responsibility provisions of part 4 of title I of the Act, including those relating to fiduciary duties under section 404.