With 2014 drawing to a close, activist investors prevailed in pushing through two large going-private transactions, including the year’s largest leveraged buyout for a U.S. company that yielded roles for four leading Am Law 100 firms.

Phoenix-based PetSmart, the largest specialty retailer of pet food and supplies in the U.S., turned to Wachtell, Lipton, Rosen & Katz to advise on an agreement announced Sunday to sell itself for $8.7 billion to a consortium led by London-based private equity firm BC Partners.