transferable to the employer), (ii) the date the employee first becomes an excluded employee, (iii) the first date on which any stock of the corporation which issued the qualified stock becomes readily tradable on an established securities market (as determined by the Secretary, but not including any market unless such market is recognized as an established securities market by the Secretary for purposes of a provision of this title other than this subsection), (iv) the date that is 5 years after the first date the rights of the employee in such stock are transferable or are not subject to a substantial risk of forfeiture, whichever occurs earlier, or (v) the date on which the employee revokes (at such time and in such manner as the Secretary provides) the election under this subsection with respect to such stock. (2) Qualified stock (A) In general For purposes of this subsection, the term qualified stock means, with respect to any qualified employee, any stock in a corporation which is the employer of such employee, if— (i) such stock is received— (I) in connection with the exercise of an option, or (II) in settlement of a restricted stock unit, and (ii) such option or restricted stock unit was granted by the corporation— (I) in connection with the performance of services as an employee, and (II) during a calendar year in which such corporation was an eligible corporation. (B) Limitation The term qualified stock shall not include any stock if the employee may sell such stock to, or otherwise receive cash in lieu of stock from, the corporation at the time that the rights of the employee in such stock first become transferable or not subject to a substantial risk of forfeiture. (C) Eligible corporation For purposes of subparagraph (A)(ii)(II)— (i) In general 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