20 C.F.R. § 404.1083

(a) The dividends you receive on shares of stock are excluded in determining your net earnings from self-employment, unless you are a dealer in stocks and securities and receive the dividends in the course of your trade or business.

(b) The interest you receive on a bond, debenture, note, certificate, or other evidence of indebtedness issued with interest coupons or in registered form by any corporation (including one issued by a government or political subdivision) is excluded in determining your net earnings from self-employment, unless you are a dealer in stocks and securities and receive the interest in the course of your trade or business.

(c) If you hold stocks or securities for investment or speculation purposes, any dividends and interest you receive that are excludable under paragraphs (a) and (b) of this section are excluded in determining your net earnings from self-employment, whether or not you are a dealer in stocks and securities.

(d) A dealer in stocks or securities is a merchant with an established place of business who is regularly engaged in the business of purchasing stocks or securities and reselling them to customers. The dealer, as a merchant, buys stocks or securities and sells them to customers with a view to making a profit. Persons who buy and sell or hold stocks or securities for investment or speculation, regardless of whether the buying or selling constitutes a trade or business, are not dealers in stocks or securities.