Yahoo has disclosed in a filing with federal regulators that following the sale of its operating business to Verizon, the company will restructure its board and change its name. It also warned that a massive hack disclosed last year could imperil its $4.8 billion sale to Verizon. Yahoo will operate as an investment company after the Verizon deal closes, it reported in the filing. It will reduce its board to five members, with David Filo, Eddy Hartenstein, Richard Hill, Marissa Meyer, Jayne Shaw and Maynard Webb departing from the board.