Stocks to watch on the Australian stock exchange at noon on Wednesday:
BHP - BHP BILLITON - down 28.00 cents, or 1.0 per cent, at $26.54
BHP Billiton has beaten its full year iron ore production guidance but has flagged a hit to its full year profit of up to $US650 million ($A876.31 million) due to weakness in its copper business.
BLD - BORAL - up 6.50 cents, or 1.02 per cent, at $6.425
Higher-than-expected property sales are expected to help boost building products maker Boral's underlying annual profit by up to 46 per cent.
NRT - NOVOGEN - down 1.5 cents, or 6.38 per cent, at 22 cents
Shares for anti-cancer drug developer Novogen have tumbled after the sudden resignation of chief executive Dr Graham Kelly.