Clifford Chance (CC), Skadden Arps Slate Meagher & Flom and DLA Piper are among a number of law firms to have advised on the initial public offering (IPO) of Pfizer’s former animal health business Zoetis, in the largest IPO by a US company since Facebook.

The listing, which went ahead on the New York Stock Exchange at the start of February, is said to have raised $2.2bn (£1.4bn), valuing the company at around $13bn (£8.3bn). Pfizer will retain an 80% ownership of Zoetis.