17 CFR 401.1: Exemption for organizations handling transactions in United States Savings Bonds.

An organization that handles United States Savings Bond transactions, including a qualified issuing or paying agent or an organization that accommodates customers or employees by forwarding requested transactions to qualified issuing or paying agents or the Treasury and whose transactions in government securities are limited to these transactions and such other activities that are exempted by the regulations under this subchapter, shall be exempt from the provisions of section 15C (a), (b) and (d) of the Act (15 U.S.C. 78o-5 (a), (b), (d)) and the regulations of this subchapter. For the purposes of this section, the term “United States Savings Bond” means any savings-type security offered by the Treasury, including all series of United States Savings Bonds, United States Savings Notes and United States Savings Stamps.