On its own, the animal-health business, growing at roughly 5% annually for the past several years, would not be considered a hot investment opportunity. But by comparison with the human-health pharma business—which actually went negative in the US in 2012, according IMS Health—5% growth in a stable, essential business is attractive. Thus, when Pfizer spun out part of its animal health business, now branded as Zoetis, raising $2.2 billion for 20% public ownership (Pfizer retains the rest), Wall Street voiced its approval. Zoetis' stock continued to rise through early March, and Zoetis is now "the largest standalone company fully devoted to animal health medicines and vaccines," as Pfizer CEO Ian Read noted. Other ownership reshufflings have proceeded apace. Bayer put down $145 million ($60 million up front) for Teva Animal Health in January, thereby getting a stronger presence in generics for both the pet (companion) and livestock (production) animal markets.