Cash each company has:

Apple:        $237.1 billion
Microsoft:  $135.9 billion
Google:     $106.4 billion
Samsung:   $82.9 billion
Oracle:        $60.1 billion
Cisco:         $46.5 billion
Facebook:  $41.2 billion
Amazon:     $29.8 billion

Total:         $740 billion

Fuente: Jon Erlichman