Mass. Gen. Laws ch. 106, § 8-204: Effect of Issuer's Restriction on Transfer

Section 8–204. A restriction on transfer of a security imposed by the issuer, even if otherwise lawful, is ineffective against a person without knowledge of the restriction unless:

(1) the security is certificated and the restriction is noted conspicuously on the security certificate; or

(2) the security is uncertificated and the registered owner has been notified of the restriction.