Financial services company IOOF Holdings Ltd on Wednesday warned shareholders that Mr Tweed had sought a copy of its shareholder register, hinting that those with stock may be targeted by the Melbourne based director.

Mr Tweed, who made the request through his company Direct Share Purchasing Corp Ltd, writes to shareholders after acquiring names and addresses from company registers.

Mr Tweed preys on some investors' lack of market knowledge and tends to make offers for their holdings well below the real market value, resulting in substantial investment losses.

His companies have previously targeted shareholders of Aevum Ltd, AMP Ltd, Coles Myer Ltd and most recently, Insurance Australia Group Ltd and Home Building Society Ltd.

IOOF chief executive Ron Dewhurst said because the Corporations Act compelled the company to provide the register, he wanted to warn shareholders that Mr Tweed was around.

"We strongly recommend shareholders take independent financial advice from an accountant, financial adviser, or stockbroker, and check the current price of IOOF shares before taking any action in response to an unsolicited offer."

"We will closely monitor the situation," Mr Dewhurst said, adding that IOOF would alert the Australian Securities and Investments Commission to the potential offer.

Earlier this month, Home Building Society said its shareholders had received an unsolicited offer of $10 per share from Mr Tweed's company, when the stock was trading around $14.44.

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