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Stocks to watch on Wednesday

Stocks to watch on the Australian stock exchange:

APO - APN OUTDOOR - up 5 cents, or 1.1 per cent, at $4.67

The billboard advertising giant is searching for a new chief executive as Richard Herring has announced he will step down at the end of September.

GMA - GENWORTH MORTGAGE INSURANCE - up 18 cents, or 6 per cent, at $3.20

As its half year profit dropped 35 per cent due to adverse portfolio revaluations, higher delinquencies and a slip in premiums, the company has announced a share buyback of up to $100 million.

RMD - RESMED - down 55 cents, or 5.7 per cent, at $9.11

The respiratory face mask and machine maker's annual profit fell slightly despite higher revenue.

RIO - RIO TINTO - down 11 cents, or 0.2 per cent, at $65.84

The mining giant's half year underlying earnings more than doubled to $US3.9 billion due to stronger commodity prices, it reported after the close of trade on the market on Wednesday.