Corrupt managers and staff from two Leighton Holdings subsidiaries stole and leaked secret tender information in an attempt to win a $ 240 million contract in the latest scandal to hit the trouble - plagued company . Confidential company documents reveal that top managers and staff from Leighton 's communications firm Silcar engaged in a conspiracy to steal detailed tender information from rival Leighton firm Visionstream earlier this year . Leaked emails by senior Leighton staff in August reveal insiders from Visionstream were suspected of assisting Silcar staff steal tender files relating to an Optus mobile network contract both firms were fighting to win . ;