A distribution of stock warrants (or other rights to acquire stock of the distributing corporation) is treated in the same manner as a stock dividend so long as the distribution of such warrants is made with respect to the corporation’s outstanding stock (and not as compensation for services, etc.).2
A distribution of stock of the distributing corporation made with respect to outstanding stock rights or convertible securities of that corporation to the owners thereof will also qualify as a stock dividend.3
1. IRC § 305(a); Treas. Reg. § 1.305-1.
2. IRC § 305(d); Treas. Reg. § 1.305-1(d).