Pfizer (PFE) plans to spin off its remaining stake in Zoetis (ZTS) through a tax-free exchange offer in which Pfizer owners can exchange their Pfizer shares for stock in Zoetis owned by Pfizer (got that?). Pfizer has received a waiver of the 180-day lock-up from the book runners of the Zoetis IPO. PFE +2.1%, ZTS -1.2% premarket.