If it's an M&A, chances are WLRK is involved. Wachtell, Lipton, Rosen & Katz specializes in representing companies involved in mergers and acquisitions and corporate securities transactions. Over the years the firm's blue-chip clients have included Schering-Plough (in its merger with Merck), Bank One (in its merger with JPMorgan Chase), and Delta Air Lines (in its acquisition of Northwest Airlines). The firm has about 240 attorneys who practice in such areas as antitrust, executive compensation and benefits, litigation, real estate, restructuring and finance, and tax.