Pershing Square Holdings Ltd. said it will invest as much as $1 billion in Howard Hughes Holdings Inc. to back its purchase of specialty insurer Vantage Group Holdings Ltd. Bill Ackman’s hedge fund agreed to buy non-voting preferred shares issued by Howard Hughes, according to a statement Thursday. Howard Hughes said in a separate statement that it was buying Vantage for about$2.1 billion. Most Read from Bloomberg Photographer: Jeenah Moon/Bloomberg Pershing Square is Howard Hughes’ largest sharehold ...