(a) For purposes of this chapter, the following identified as a stockholder in a corporation's current record of stockholders constitutes one stockholder:
(1) three or fewer co-owners;
(2) a corporation, partnership, trust, estate, or other entity; and
(3) the trustees, guardians, custodians, or other fiduciaries of a single trust, estate, or account.
(b) For purposes of this chapter, stockholdings registered in substantially similar names constitute one stockholder if it is reasonable to believe that the names represent the same person.