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Stocks to watch

Stocks to watch on the Australian stock exchange:

A2M - THE A2 MILK COMPANY - up 18 cents, or 2.4 per cent, at $7.60

Dairy producer The A2 Milk Company is dramatically expanding its business in the United States, rolling out its products across the north-east of the country to give it a presence in 5,000 stores nationwide.

OZL - OZ MINERALS - up 9 cents, or one per cent, at $9.17

Oz Minerals says it is in a good place to enable its growth plans with fourth-quarter gold production up 34 per cent on the previous three months and exceeding the miner's 2017 guidance.

S32 - SOUTH32 - down 6 cents, or 1.5 per cent, at $3.92

Diversified miner South32 has boosted its expectations for South Africa manganese production and maintained full-year guidance for all other products after a solid first-half performance.

SRX - SIRTEX MEDICAL - up $2.18, or 13.9 per cent, at $17.83

Sirtex Medical shares have surged after the liver cancer treatment specialist flagged improved first-half earnings and a turnaround in second-half sales.