US stocks have rebounded from early losses to snap a four-day losing streak after US President Donald Trump and Treasury Secretary Steven Mnuchin said trade talks between the United States and China were "constructive".

Australia Post's letter delivery service has plunged back into the red and is dragging down the government-owned enterprise's profitability, even as online shopping sees its parcel delivery business boom.

If productivity, production and prices are the three "Ps" that drive miners' earnings, BHP missed on two of its ''Ps.''

Scandal-hit financial advice group IOOF Holdings is taking action to redeem itself with the financial regulator and investors as its two most senior executives remain sidelined awaiting court action.

The world's biggest miner BHP has reported an eight per cent fall in its underlying attributable profit to $US4.03 billion for the December half