The term eligible corporation means, with respect to any calendar year, any corporation if— (I) no stock of such corporation (or any predecessor of such corporation) is readily tradable on an established securities market (as determined under paragraph (1)(B)(iii)) during any preceding calendar year, and (II) such corporation has a written plan under which, in such calendar year, not less than 80 percent of all employees who provide services to such corporation in the United States (or any possession of the United States) are granted stock options, or restricted stock units, with the same rights and privileges to receive qualified stock. (ii) Same rights and privileges For purposes of clause (i)(II)— (I) except as provided in subclauses (II) and (III), the determination of rights and privileges with respect to stock shall be made in a similar manner as under section 423(b)(5), (II) employees shall not fail to be treated as having the same rights and privileges to receive qualified stock solely because the number of shares available to all employees is not equal in amount, so long as the number of shares available to each employee is more than a de minimis amount, and (III) rights and privileges with respect to the exercise of an option shall not be treated as the same as rights and privileges with respect to the settlement of a restricted stock unit. (iii) Employee For purposes of clause (i)(II), the term employee shall not include any employee described in section 4980E(d)(4) or any excluded employee. (iv) Special rule for calendar years before 2018 In the case of any calendar year beginning before January 1, 2018, clause (i)(II) shall be applied without regard to whether the rights and privileges with respect to the qualified stock are the same. (3) Qualified employee