Petco, portfolio company of prominent PE firms TPG, Leonard Green & Partners and Freeman Spogli & Co., has filed preliminary documents for an IPO. Founded in 1965, Petco is a provider of pet food, supplies and services, operating over 1400 stores in all 50 U.S. states and the District of Columbia, as well as 13 in Mexico through a joint venture. The company has already twice been listed on public exchanges, with the first time being in 1994. In its fiscal 2014, Petco generated net income of $75.3 million on net sales of nearly $4 billion and increased its adjusted EBITDA to $457 million. Currently, TPG holds a 46.8% pre-IPO stake and LG&P holds a 37.5% interest, while Freeman Spogli owns 6.7%.