(a) For purposes of this chapter, the following, identified as a shareholder in a corporation's current record of shareholders, constitutes one shareholder:
(1) Three or fewer coowners;
(2) A corporation, partnership, trust, estate or other entity; or
(3) The trustees, guardians, custodians or other fiduciaries of a single trust, estate or account.
(b) For purposes of this chapter, shareholdings registered in substantially similar names constitute one shareholder if it is reasonable to believe that the names represent the same person.