N.Y. Est. Powers & Trusts Law § 13-4.2

§ 13-4.2 Registration in beneficiary form; sole or joint tenancy\n ownership\n Only individuals whose registration of a security shows sole ownership\nby one individual or multiple ownership by two or more with right of\nsurvivorship, rather than as tenants in common, may obtain registration\nin beneficiary form. Multiple owners of a security registered in\nbeneficiary form hold as joint tenants with right of survivorship, as\ntenants by the entireties or as owners of community property held in\nsurvivorship form, and not as tenants in common.\n