By reason of
(4) By reason of. (i) For a change in an option or issuance of a new option to qualify as a substitution or assumption under this paragraph (a), the change must be made by an eligible corporation (as defined in paragraph (a)(2) of this section) and occur by reason of a corporate transaction (as defined in paragraph (a)(3) of this section). (ii) Generally, a change in an option or issuance of a new option is considered to be by reason of a corporate transaction, unless the relevant facts and circumstances demonstrate that such change or issuance is made for reasons unrelated to such corporate transaction. For example, a change in an option or issuance of a new option will be considered to be made for reasons unrelated to a corporate transaction if there is an unreasonable delay between the corporate transaction and such change in the option or issuance of a new option, or if the corporate transaction serves no substantial corporate business purpose independent of the change in options. Similarly, a change in the number or price of shares purchasable under an option merely to reflect market fluctuations in the price of the stock purchasable under an option is not by reason of a corporate transaction. (iii) A change in an option or issuance of a new option is by reason of a distribution or change in the terms or number of the outstanding shares of a corporation (as described in paragraph (a)(3)(ii) of this section) only if the option as changed, or the new option issued, is an option on the same stock as under the old option (or if such class of stock is eliminated in the change in capital structure, on other stock of the same corporation). (5) Other requirements. For a change in an option or issuance of a new option to qualify as a substitution or assumption under this paragraph (a), all of the requirements described in this paragraph (a)(5) must be met. (i) In the case of an issuance of a new option (or a portion thereof) in exchange for an old option (or portion thereof), the optionee's rights under the old option (or portion thereof) must be canceled, and the optionee must lose all rights under the old option (or portion thereof). There cannot be a substitution of a new option for an old option within the meaning of this paragraph (a) if the optionee may exercise both the old option and the new option. It is not necessary to have a complete substitution of a new option for the old option. However, any portion of such option which is not substituted or assumed in a transaction to which this paragraph (a) applies is an outstanding option to purchase stock or, to the extent paragraph (e) of this section applies, a modified option. (ii) The excess of the aggregate fair market value of the shares subject to the new or assumed option immediately after the change in the option or issuance of a new option over the aggregate option price of such shares must not exceed the excess of the aggregate fair market value of all shares subject to the old option (or portion thereof) immediately before the change in the option or issuance of a new option over the aggregate option price of such shares. (iii) On a share by share comparison, the ratio of the option price to the fair market value of the shares subject to the option immediately after the change in the option or issuance of a new option must not be more favorable to the optionee than the ratio of the option price to the fair market value of the stock subject to the old option (or portion thereof) immediately before the change in the option or issuance of a new option. The number of shares subject to the new or assumed option may be adjusted to compensate for any change in the aggregate spread between the aggregate option price and the aggregate fair market value of the shares subject to the option immediately after the change in the option or issuance of the new option as compared to the aggregate spread between the option price and the aggregate fair market value of the shares subject to the option immediately before the change in the option or issuance of the new option. (iv) The new or assumed option must contain all terms of the old option, except to the extent such terms are rendered inoperative by reason of the corporate transaction. (v) The new option or assumed option must not give the optionee additional benefits that the optionee did not have under the old option. (6) Obligation to substitute or assume not necessary. For a change in the option or issuance of a new option to meet the requirements of this paragraph (a), it is not necessary to show that the corporation changing an option or issuing a new option is under any obligation to do so. In fact, this paragraph (a) may apply even when the option that is being replaced or assumed expressly provides that it will terminate upon the occurrence of certain corporate transactions. However, this paragraph (a) cannot be applied to revive a statutory option which, for reasons not related to the corporate transaction, expires before it can properly be replaced or assumed under this paragraph (a). (7) Issuance of stock without meeting the requirements of this paragraph (a). A change in the terms of an option resulting in a modification of such option occurs if an optionee's new employer (or a related corporation of the new employer) issues its stock (or stock of a related corporation) upon exercise of such option without satisfying all of the requirements described in paragraphs (a)(4) and (5) of this section. (8) Date of grant. For purposes of applying the rules of this paragraph (a), a substitution or assumption is considered to occur on the date that the optionee would, but for this paragraph (a), be considered to have been granted the option that the eligible corporation is substituting or assuming. A substitution or an assumption that occurs by reason of a corporate transaction may occur before or after the corporate transaction. (9) Any reasonable methods may be used to determine the fair market value of the stock subject to the option immediately before the assumption or substitution and the fair market value of the stock subject to the option immediately after the assumption or substitution. Such methods include the valuation methods described in 20.2031-2 of this chapter (the Estate Tax Regulations). In the case of stock listed on a stock exchange, the fair market value may be based on the last sale before and the first sale after the assumption or substitution if such sales clearly reflect the fair market value of the stock, or may be based upon an average selling price during a longer period, such as the day or week before, and the day or week after, the assumption or substitution. If the stocks are not listed, or if they are newly issued, it will be reasonable to base the determination on experience over even longer periods. In the case of a merger, consolidation, or other reorganization which is arrived at by arm's-length negotiations, the fair market value of the stocks subject to the option before and after the assumption or substitution may be based upon the values assigned to the stock for purposes of the reorganization. For example, if in the case of a merger the parties treat each share of the merged company as being equal in value to a share of the surviving company, it will be reasonable to assume that the stocks are of equal value so that the substituted option may permit the employee to purchase at the same price one share of the surviving company for each share he could have purchased of the merged company. (10) Examples. The principles of this paragraph (a) are illustrated by the following examples: