Arab Contractors bids for Riyadh metro; prequalification date likely to be extended June 18, 2012 | Middle East & Africa News The Arab Contractors (Osman Ahmed Osman and Company), Riyadh-based construction company, has submitted a prequalification bid for the USD3-billion Riyadh metro project being developed b... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password