The following are the top stories in the Financial Times. Reuters has not verified these stories and does not vouch for their accuracy. Headlines FTC lawsuit targets serial acquisitions by private equity Rupert Murdoch steps down as chair of Fox and News Corp Venture firm GGV Capital to split off China business after US pressure Cisco agrees $28bn deal for cyber security group Splunk Overview - Private equity firm Welsh, Carson, Anderson & Stowe has been charged with a "multiyear anti-competitive scheme" targeting anesthesiology practises in the Federal Trade Commission's first antitrust complaint filed under chair Lina Khan, challenging serial...