17 CFR 240.16a-11: a-11 Dividend or interest reinvestment plans.

Any acquisition of securities resulting from the reinvestment of dividends or interest on securities of the same issuer shall be exempt from section 16 of the Act if the acquisition is made pursuant to a plan providing for the regular reinvestment of dividends or interest and the plan provides for broad-based participation, does not discriminate in favor of employees of the issuer, and operates on substantially the same terms for all plan participants.