Mass. Gen. Laws ch. 156B, § 30: Certificate for stock transferred as collateral security

Section 30. A pledgee of certificated stock transferred as collateral security shall be entitled to a new certificate if the instrument of transfer substantially describes the debt or duty which is intended to be secured thereby. Such new certificate shall express on its face that it is held as collateral security, and the name of the pledgor shall be stated thereon, who alone shall be liable as a stockholder, and entitled to vote thereon.