Stocks to watch on the Australian stock exchange:

CAB – CABCHARGE – steady, at $1.815

Cabcharge has reduced its first-half loss, thanks to its expanded taxi fleet helping lift revenue in the face of growing competition from ride-sharing services such as Uber.

CGC – COSTA GROUP HOLDINGS – up 59 cents, or 4.5 per cent, at $6.82

Costa Group has lifted underlying first-half profit 14.5 per cent to $28.6 million after a near 10 per cent rise in revenue for the fruit and vegetable grower.

CTX – CALTEX AUSTRALIA – up $1.50, or 4.3 per cent, at $36.50

Fuel retailer Caltex Australia will spend up to $120 million in buying out its franchisees to have only company owned service stations by 2020.

ILU – ILUKA RESOURCES – up 50 cents, or 4.9 per cent, at $10.68

Iluka Resources has trimmed its full-year loss by nearly a quarter to $171.6 million with the mineral sands miner’s revenue lifting 39 per cent.

RIO – RIO TINTO – up $1.07, or 1.3 per cent, at $81.67

Rio Tinto has agreed to offload a bundle of aluminium assets including an Icelandic smelter for a total $345 million.

STO – SANTOS – down 4.5 cents, or 0.9 per cent, at $5.025

Santos says production at its LNG Hides plant and Kutubu gas facilities in Papua New Guinea have been shut down following the magnitude-7.5 earthquake and aftershocks in the country’s southern highlands.