Massachusetts General Laws
Article VI - Nonprobate Transfers on Death
Section 6-306 - Effect of Registration in Beneficiary Form

Section 6–306. [Effect of Registration in Beneficiary Form.]
The designation of a transfer on death beneficiary on a registration in beneficiary form shall have no effect on ownership until the owner's death. A registration of a security in beneficiary form may be canceled or changed at any time by the sole owner or all surviving owners without the consent of the beneficiary.