Plans by David Teoh's TPG to launch a new mobile network will add to pressure on Telstra CEO Andy Penn.

Telstra faces its Amazon moment

The trio of companies that control 90 per cent of the mobile phone market – Telstra, Optus and Vodafone – are facing the telco version of Amazon as David Teoh's TPG prepares to enter the $20 billion a year mobile market.

Wesfarmers CEO Rob Scott is shopping for growth as Coles managing director John Durkan departs.

Action man Scott goes for growth

Wesfarmers chief executive Rob Scott's move to demerge Coles in a transaction that could value the supermarket chain at up to $18.5 billion is all about giving Wesfarmers shareholders a bigger slice of the Bunnings earnings machine.